Nume: Issei Okamura
Å¢ara: Japonia
Data naşterii: 26.05.92, 31 Vârsta
Clasament ATP: 870
TOP poziţie în clasament: 574 (08.08.16, 55 puncte)
Puncte: 15
Premii: 59670 $
Total meciuri: 443
Victorii: 211
Succes: 47.63 %
Å¢ara: Japonia
Data naşterii: 26.05.92, 31 Vârsta
Clasament ATP: 870
TOP poziţie în clasament: 574 (08.08.16, 55 puncte)
Puncte: 15
Premii: 59670 $
Total meciuri: 443
Victorii: 211
Succes: 47.63 %
| an | sumar | Hard | Zgura | In. Hard | Carpet | Iarbă | Acryl |
| 2024 | 8/9 | 8/9 | 0/0 | 0/0 | 0/0 | 0/0 | 0/0 |
| 2023 | 18/24 | 17/18 | 0/4 | 1/2 | 0/0 | 0/0 | 0/0 |
| 2022 | 12/14 | 11/12 | 1/2 | 0/0 | 0/0 | 0/0 | 0/0 |
| 2021 | 8/10 | 8/8 | 0/2 | 0/0 | 0/0 | 0/0 | 0/0 |
| 2020 | 11/11 | 11/11 | 0/0 | 0/0 | 0/0 | 0/0 | 0/0 |
| 2019 | 18/26 | 13/22 | 1/2 | 0/0 | 0/0 | 4/2 | 0/0 |
| 2018 | 28/27 | 23/21 | 4/4 | 1/1 | 0/1 | 0/0 | 0/0 |
| 2017 | 14/32 | 11/19 | 2/8 | 0/2 | 1/3 | 0/0 | 0/0 |
| 2016 | 33/33 | 19/22 | 13/7 | 0/2 | 1/2 | 0/0 | 0/0 |
| 2015 | 40/27 | 31/21 | 9/5 | 0/1 | 0/0 | 0/0 | 0/0 |
| 2014 | 7/10 | 5/5 | 0/2 | 0/1 | 2/2 | 0/0 | 0/0 |
| 2013 | 12/7 | 12/6 | 0/0 | 0/0 | 0/1 | 0/0 | 0/0 |
| 2012 | 2/2 | 1/1 | 1/1 | 0/0 | 0/0 | 0/0 | 0/0 |
| ÃŽN TOTAL | 211/232 | 170/175 | 31/37 | 2/9 | 4/9 | 4/2 | 0/0 |
| succes % | 47.63 % | 49.28 % | 45.59 % | 18.18 % | 30.77 % | 66.67 % | 0 % |
Issei Okamura / nejucate / ultimele
| nu a fost găsit nici un meci |
Issei Okamura form / suprafaţa: Hard
Issei Okamura / suprafaţa: Hard
| 31.03.24 | 1-a rundă de calif. | Yeongseok Jeong | Issei Okamura | 6-2, 7-65 |  | detaliu meci |  M15 Kashiwa | Hard |
| 24.03.24 | 1-a rundă de calif. | Masamichi Imamura | Issei Okamura | 7-63, 7-61 | | detaliu meci | M15 Tsukuba | Hard |
| 18.03.24 | 1-a rundă de calif. | Jumpei Yamasaki | Issei Okamura | 6-2, 6-1 | | detaliu meci | M15 Nishi | Hard |
| 11.03.24 | Calificare | Koki Matsuda | Issei Okamura | 6-4, 6-3 | | detaliu meci | M15 Hinode | Hard |
| 11.03.24 | 2-a rundă de calif. | Issei Okamura | Yudai Umeoka | 6-3, 7-65 |  | detaliu meci | ||
| 10.03.24 | 1-a rundă de calif. | Issei Okamura | Kodai Sasaki | 6-0, 6-1 | | detaliu meci | ||
| 27.02.24 | Calificare | Jesse Delaney | Issei Okamura | 6-4, 6-4 | | detaliu meci |  M25 Traralgon | Hard |
| 26.02.24 | 2-a rundă de calif. | Issei Okamura | Winter Meagher | 6-2, 6-2 | | detaliu meci | ||
| 21.02.24 | 1-a rundă | Matthew Hulme | Issei Okamura | 1-6, 6-3, 6-3 | | detaliu meci | M25 Traralgon | Hard |
| 20.02.24 | Calificare | Issei Okamura | Yuta Kikuchi | 6-1, 5-7, 10-6 | | detaliu meci | ||
| 19.02.24 | 2-a rundă de calif. | Issei Okamura | Cooper Errey | 6-4, 7-63 | | detaliu meci | ||
| 17.01.24 | a 2-a rundă | Ali Habib | Issei Okamura | 6-3, 6-2 | | detaliu meci |  M25 Doha | Hard |
| 16.01.24 | 1-a rundă | Issei Okamura | Saba Purtseladze | 6-4, 7-5 | | detaliu meci | ||
| 15.01.24 | Calificare | Alberto Lim | Issei Okamura | 6-0, 6-0 | | detaliu meci | ||
| 14.01.24 | 1-a rundă de calif. | Issei Okamura | Ali Alshati | 6-2, 6-0 | | detaliu meci | ||
| 09.01.24 | Calificare | Anmar Faleh Alhogbani | Issei Okamura | 7-65, 6-2 | | detaliu meci | M15 Doha | Hard |
| 08.01.24 | 1-a rundă de calif. | Issei Okamura | Vivek Kolluru | 6-1, 1-0, Vivek Kolluru - retragere | | detaliu meci | ||
| 25.12.23 | 1-a rundă de calif. | Jay Dylan Hara Friend | Issei Okamura | 6-2, 6-2 | | detaliu meci | M15 Yanagawa | Hard |
| 02.11.23 | a 2-a rundă | Niklas Schell | Issei Okamura | 7-66, 6-1 | | detaliu meci |  M15 Al | Hard |
| 01.11.23 | 1-a rundă | Issei Okamura | Ali Alshati | 6-3, 6-1 | | detaliu meci | ||
| 19.09.23 | 1-a rundă | Zaharije-Zak Talic | Issei Okamura | 7-65, 3-6, 6-3 | | detaliu meci | M25 Darwin | Hard |
| 14.09.23 | a 2-a rundă | Brandon Walkin | Issei Okamura | 6-73, 6-2, 6-3 | | detaliu meci | M25 Darwin | Hard |
| 13.09.23 | 1-a rundă | Issei Okamura | Mason Naumovski | 6-4, 4-6, 6-4 | | detaliu meci | ||
| 07.09.23 | a 2-a rundă | Sora Fukuda | Issei Okamura | 6-1, 6-2 | | detaliu meci | M25 Sapporo | Hard |
| 05.09.23 | 1-a rundă | Issei Okamura | Seiya Nakanishi | 6-1, 6-1 | | detaliu meci | ||
| 04.09.23 | Calificare | Issei Okamura | Shinnosuke Hiramatsu | 7-5, 6-4 | | detaliu meci | ||
| 03.09.23 | 1-a rundă de calif. | Issei Okamura | Iori Yoshida | 6-0, 6-1 | | detaliu meci | ||
| 09.08.23 | 1-a rundă | Amit Vales | Issei Okamura | 6-4, 3-6, 6-3 | | detaliu meci |  M25 Herzlia | Hard |
| 08.08.23 | Calificare | Issei Okamura | Eyal Shyovitz | 6-4, 6-3 | | detaliu meci | ||
| 07.08.23 | 1-a rundă de calif. | Issei Okamura | Raz Katz | 6-1, 6-1 | | detaliu meci | ||
| 01.08.23 | 1-a rundă | Ofek Shimanov | Issei Okamura | 4-6, 6-3, 6-2 | | detaliu meci | M15 Raanana | Hard |
| 27.06.23 | 1-a rundă | Koki Matsuda | Issei Okamura | 6-3, 7-66 | | detaliu meci |  M15 Jakarta | Hard |
| 11.06.23 | 1-a rundă de calif. | Sung Woo Cho | Issei Okamura | 6-4, 7-63 | | detaliu meci |  M25 Changwon | Hard |
| 05.06.23 | 2-a rundă de calif. | Chan-Yeong Oh | Issei Okamura | 6-1, 4-6, 10-7 | | detaliu meci | M25 Daegu | Hard |
| 04.06.23 | 1-a rundă de calif. | Issei Okamura | Jin Sung Han | 7-5, 6-3 | | detaliu meci | ||
| 01.05.23 | Calificare | Ryan James Storrie | Issei Okamura | 6-3, 6-3 | | detaliu meci |  M25 Nottingham | Hard |
| 30.04.23 | 1-a rundă de calif. | Issei Okamura | Joseph White | 6-0, 6-2 | | detaliu meci | ||
| 25.04.23 | Calificare | George Houghton | Issei Okamura | 6-2, 6-1 | | detaliu meci | M25 Nottingham | Hard |
| 24.04.23 | 1-a rundă de calif. | Issei Okamura | Max Benaim | 6-4, 6-4 | | detaliu meci | ||
| 06.04.23 | a 2-a rundă | Kaito Uesugi | Issei Okamura | 6-1, 6-4 | | detaliu meci | M25 Kashiwa | Hard |
| 05.04.23 | 1-a rundă | Issei Okamura | Sho Shimabukuro | 7-64, 0-6, 7-64 | | detaliu meci | ||
| 03.04.23 | Calificare | Issei Okamura | Koki Matsuda | 6-1, 6-2 | | detaliu meci | ||
| 02.04.23 | 1-a rundă de calif. | Issei Okamura | Taketo Takamisawa | 6-1, 6-2 | | detaliu meci | ||
| 27.03.23 | Calificare | Ryotaro Taguchi | Issei Okamura | 7-5, 6-2 | | detaliu meci | M25 Tsukuba | Hard |
| 27.03.23 | 1-a rundă de calif. | Issei Okamura | Seiya Nakanishi | 6-2, 6-4 | | detaliu meci | ||
| 08.02.23 | 1-a rundă | Adam Walton | Issei Okamura | 6-3, 6-4 | | detaliu meci | M25 Burnie | Hard |
| 06.02.23 | Calificare | Issei Okamura | Stefan Vujic | 7-63, 7-65 | | detaliu meci | ||
| 05.02.23 | 1-a rundă de calif. | Issei Okamura | Mason Naumovski | 6-1, 6-3 | | detaliu meci | ||
| 30.01.23 | Calificare | Yusuke Takahashi | Issei Okamura | 6-4, 6-2 | | detaliu meci | Burnie Challenger | Hard |
| 29.01.23 | 1-a rundă de calif. | Issei Okamura | Liam Puttergill | 6-1, 6-3 | | detaliu meci | ||
| 23.01.23 | 2-a rundă de calif. | Bang Shuo Yin | Issei Okamura | 7-64, 5-7, 10-5 | | detaliu meci | M15 Jakarta | Hard |
| 16.01.23 | 2-a rundă de calif. | Manish Ganesh | Issei Okamura | 3-6, 6-3, 10-3 | | detaliu meci | M15 Jakarta | Hard |
| 01.11.22 | 1-a rundă | Fitriadi M Rifqi | Issei Okamura | 6-1, 6-3 | | detaliu meci | M25 Jakarta | Hard |
| 29.09.22 | a 2-a rundă | Shinji Hazawa | Issei Okamura | 6-1, 6-4 | | detaliu meci | M25 Kashiwa | Hard |
| 28.09.22 | 1-a rundă | Issei Okamura | Takuto Niki | 6-3, 7-63 | | detaliu meci | ||
| 07.09.22 | 1-a rundă | Tatsuma Ito | Issei Okamura | 6-1, 6-2 | | detaliu meci | M25 Sapporo | Hard |
| 05.09.22 | Calificare | Issei Okamura | Taiki Nagamine | 6-1, 6-3 | | detaliu meci | ||
| 31.08.22 | 1-a rundă | Duckhee Lee | Issei Okamura | 5-7, 6-1, 6-3 | | detaliu meci | M15 Daegu | Hard |
| 26.08.22 | Sfert de finală | Ajeet Rai | Issei Okamura | 6-1, 6-72, 6-3 | | detaliu meci | M15 Changwon | Hard |
| 25.08.22 | a 2-a rundă | Issei Okamura | Duckhee Lee | 6-2, 3-6, 7-5 | | detaliu meci | ||
| 23.08.22 | 1-a rundă | Issei Okamura | Min Seong Kim | 6-4, 6-0 | | detaliu meci | ||
| 15.08.22 | 2-a rundă de calif. | Amor Jasika | Issei Okamura | 6-3, 6-4 | | detaliu meci | M15 Jakarta | Hard |
| 14.08.22 | 1-a rundă de calif. | Issei Okamura | Roy Hobbs | 6-4, 6-4 | | detaliu meci | ||
| 10.08.22 | 1-a rundă | Shintaro Imai | Issei Okamura | 6-0, 6-1 | | detaliu meci | M15 Jakarta | Hard |
| 09.08.22 | Calificare | Issei Okamura | Anthony Susanto | 6-1, 7-5 | | detaliu meci | ||
| 08.08.22 | 2-a rundă de calif. | Issei Okamura | Phuc Huynh | 6-1, 4-6, 10-4 | | detaliu meci | ||
| 07.08.22 | 1-a rundă de calif. | Issei Okamura | Jeremy Nahor | 6-0, 6-0 | | detaliu meci | ||
| 09.06.22 | a 2-a rundă | Rio Noguchi | Issei Okamura | 1-6, 6-3, 6-1 | | detaliu meci |  M25 Harmon | Hard |
| 08.06.22 | 1-a rundă | Issei Okamura | Daiki Yoshimura | 6-3, 6-78, 6-4 | | detaliu meci | ||
| 31.05.22 | 1-a rundă | Geun Jun Kim | Issei Okamura | 7-64, 5-7, 6-4 | | detaliu meci | M25 Harmon | Hard |
| 19.04.22 | Calificare | Thantub Suksumrarn | Issei Okamura | 6-3, 7-66 | | detaliu meci |  M15 Chiang | Hard |
| 18.04.22 | 2-a rundă de calif. | Issei Okamura | Suphawat Saeoui | 6-4, 6-2 | | detaliu meci | ||
| 17.04.22 | 1-a rundă de calif. | Issei Okamura | Ishaque Eqbal | 6-4, 3-6, 10-4 | | detaliu meci | ||
| 10.04.22 | 1-a rundă de calif. | Alexander Crnokrak | Issei Okamura | 6-3, 6-4 | | detaliu meci | M15 Chiang | Hard |
| 05.04.22 | 1-a rundă | Orel Kimhi | Issei Okamura | 6-75, 7-65, 6-2 | | detaliu meci | M15 Chiang | Hard |
| 15.06.21 | 1-a rundă de calif. | Axel Nefve | Issei Okamura | 6-3, 6-2 | | detaliu meci |  M25 Tulsa | Hard |
| 08.06.21 | 2-a rundă de calif. | Gabriel Evans | Issei Okamura | 6-2, 4-6, 10-8 | | detaliu meci |  M25 Santo | Hard |
| 02.06.21 | 1-a rundă | Jose Olivares | Issei Okamura | 6-3, 6-2 | | detaliu meci | M25 Santo | Hard |
| 01.06.21 | Calificare | Issei Okamura | Ronan Jachuck | 3-6, 7-5, 10-7 | | detaliu meci | ||
| 01.06.21 | 2-a rundă de calif. | Issei Okamura | Alberto Puello | 6-1, 6-0 | | detaliu meci | ||
| 08.04.21 | a 2-a rundă | Nicolas Moreno De Alboran | Issei Okamura | 7-5, 6-1 | | detaliu meci |  M15 Sharm | Hard |
| 07.04.21 | 1-a rundă | Issei Okamura | Alexandros Skorilas | 7-5, 6-2 | | detaliu meci | ||
| 31.03.21 | 1-a rundă | Petros Chrysochos | Issei Okamura | 6-2, 6-4 | | detaliu meci | M15 Sharm | Hard |
| 30.03.21 | Calificare | Issei Okamura | Lewie Lane | 6-4, 1-6, 10-6 | | detaliu meci | ||
| 29.03.21 | 1-a rundă de calif. | Issei Okamura | Michal Novansky | 6-1, 6-1 | | detaliu meci | ||
| 29.03.21 | 2-a rundă de calif. | Issei Okamura | Ivan Mikhaylyuk | 6-1, 6-2 | | detaliu meci | ||
| 22.03.21 | 1-a rundă de calif. | Tim Handel | Issei Okamura | 6-4, 6-4 | | detaliu meci | M15 Sharm | Hard |
| 08.02.21 | 1-a rundă de calif. | Erik Crepaldi | Issei Okamura | 6-3, 6-0 | | detaliu meci | M15 Sharm | Hard |
| 02.02.21 | Calificare | Erik Crepaldi | Issei Okamura | 6-0, 6-3 | | detaliu meci | M15 Sharm | Hard |
| 01.02.21 | 2-a rundă de calif. | Issei Okamura | Maikel De Boes | 6-3, 6-1 | | detaliu meci | ||
| 31.01.21 | 1-a rundă de calif. | Issei Okamura | Taisei Ichikawa | 7-65, 3-6, 10-7 | | detaliu meci | ||
| 09.11.20 | 2-a rundă de calif. | Andres Gabriel Ciurletti | Issei Okamura | 4-6, 6-4, 11-9 | | detaliu meci | M15 Sharm | Hard |
| 08.11.20 | 1-a rundă de calif. | Issei Okamura | Shahar Gabay | 6-0, 6-1 | | detaliu meci | ||
| 03.11.20 | Calificare | Marat Deviatiarov | Issei Okamura | 6-0, 6-1 | | detaliu meci | M15 Sharm | Hard |
| 02.11.20 | 2-a rundă de calif. | Issei Okamura | Alec Beckley | 6-3, 6-2 | | detaliu meci | ||
| 02.11.20 | 1-a rundă de calif. | Issei Okamura | Leo Borg | 6-1, 6-4 | | detaliu meci | ||
| 25.10.20 | 1-a rundă de calif. | Max Houkes | Issei Okamura | 6-2, 4-6, 10-5 | | detaliu meci | M15 Sharm | Hard |
| 18.10.20 | 1-a rundă de calif. | Max Houkes | Issei Okamura | 7-65, 2-6, 10-5 | | detaliu meci | M15 Sharm | Hard |
| 13.09.20 | 1-a rundă de calif. | Arnaud Bovy | Issei Okamura | 6-0, 6-0 | | detaliu meci |  M15 Sintra | Hard |
| 07.09.20 | 2-a rundă de calif. | Joao Lucas Reis Da Silva | Issei Okamura | 7-5, 7-63 | | detaliu meci | M15 Sintra | Hard |
| 06.09.20 | 1-a rundă de calif. | Issei Okamura | Tennyson Whiting | 6-4, 6-4 | | detaliu meci | ||
| 11.03.20 | 1-a rundă | Issei Okamura | Noah Thurner | 6-1, 6-4 | | detaliu meci | M15 Sharm | Hard |
| 03.03.20 | Calificare | Vladimir Uzhylovsky | Issei Okamura | 6-76, 6-4, 10-6 | | detaliu meci | M15 Sharm | Hard |
| 02.03.20 | 2-a rundă de calif. | Issei Okamura | Jarno Jans | 6-2, 6-4 | | detaliu meci | ||
| 26.02.20 | 1-a rundă | Ryota Tanuma | Issei Okamura | 6-3, 6-2 | | detaliu meci | M15 Sharm | Hard |
| 25.02.20 | Calificare | Issei Okamura | Phuong Van Nguyen | 6-3, 4-6, 10-6 | | detaliu meci | ||
| 24.02.20 | 2-a rundă de calif. | Issei Okamura | Ismael Changawa Ruwa Mzai | 6-3, 3-6, 10-5 | | detaliu meci | ||
| 20.02.20 | a 2-a rundă | Jacopo Berrettini | Issei Okamura | 6-1, 6-2 | | detaliu meci | M15 Sharm | Hard |
| 19.02.20 | 1-a rundă | Issei Okamura | Piotr Grynkowski | 6-3, 7-5 | | detaliu meci | ||
| 26.01.20 | 1-a rundă de calif. | Palaphoom Kovapitukted | Issei Okamura | 6-4, 6-1 | | detaliu meci | M25 Nonthaburi | Hard |
| 08.01.20 | 1-a rundă | Adam El Mihdawy | Issei Okamura | 4-6, 6-2, 6-3 | | detaliu meci |  M15 Hong | Hard |
| 07.01.20 | Calificare | Issei Okamura | Chayanon Kaewsuto | 6-0, 6-0 | | detaliu meci | ||
| 06.01.20 | 1-a rundă de calif. | Issei Okamura | Douglas Geiwald | 6-2, 6-1 | | detaliu meci | ||
| 15.11.19 | 1-a rundă | Mariano Kestelboim | Issei Okamura | 6-4, 6-1 | | detaliu meci |  M15 Cancun | Hard |
| 05.11.19 | 1-a rundă | Mateus Alves | Issei Okamura | 6-3, 6-2 | | detaliu meci | M15 Cancun | Hard |
| 15.10.19 | 1-a rundă | Cheong-Eui Kim | Issei Okamura | 6-4, 4-6, 6-4 | | detaliu meci | M15 Changwon | Hard |
| 08.10.19 | 1-a rundă | Tristan Schoolkate | Issei Okamura | 6-3, 2-6, 6-4 | | detaliu meci | M25 Toowoomba | Hard |
| 01.10.19 | 1-a rundă | Tomas Barrios Vera | Issei Okamura | 6-4, 6-4 | | detaliu meci | M25 Brisbane | Hard |
| 25.09.19 | 1-a rundă | Yu Hsiou Hsu | Issei Okamura | 6-0, 7-5 | | detaliu meci | M25 Darwin | Hard |
| 04.09.19 | 1-a rundă | Bradley Mousley | Issei Okamura | 6-4, 7-5 | | detaliu meci | M15 Hua | Hard |
| 03.09.19 | Calificare | Issei Okamura | Uisung Park | 6-3, 6-4 | | detaliu meci | ||
| 02.09.19 | 1-a rundă de calif. | Issei Okamura | Bingyu Yu | 6-1, 6-2 | | detaliu meci | ||
| 29.08.19 | a 2-a rundă | Yu Hsiou Hsu | Issei Okamura | 6-2, 6-0 | | detaliu meci | M15 Hua | Hard |
| 28.08.19 | 1-a rundă | Issei Okamura | Soichiro Moritani | 6-4, 3-6, 6-3 | | detaliu meci | ||
| 21.08.19 | 1-a rundă | Yu Hsiou Hsu | Issei Okamura | 6-2, 6-1 | | detaliu meci | M15 Hua | Hard |
| 05.08.19 | 1-a rundă | Jie Cui | Issei Okamura | 6-3, 6-3 | | detaliu meci | Yokkaichi Challenger | Hard |
| 29.07.19 | 1-a rundă | Yusuke Takahashi | Issei Okamura | 6-1, 6-2 | | detaliu meci |  Chengdu Challenger | Hard |
| 22.07.19 | 1-a rundă | Takanyi Garanganga | Issei Okamura | 6-4, 6-4 | | detaliu meci |  Granby Challenger | Hard |
| 08.07.19 | 1-a rundă | Justin Boulais | Issei Okamura | 6-2, 7-5 | | detaliu meci | Winnipeg Challenger | Hard |
| 05.06.19 | 1-a rundă | Seita Watanabe | Issei Okamura | 6-4, 7-65 | | detaliu meci | M15 Daegu | Hard |
| 30.05.19 | a 2-a rundă | Wei Qiang Zheng | Issei Okamura | 2-6, 6-2, 6-0 | | detaliu meci | M25 Luzhou | Hard |
| 29.05.19 | 1-a rundă | Issei Okamura | Yu Hsiang Chiu | 6-4, 6-1 | | detaliu meci | ||
| 16.05.19 | a 2-a rundă | Yu Hsiou Hsu | Issei Okamura | 6-3, 7-5 | | detaliu meci | M25 Luan | Hard |
| 14.05.19 | 1-a rundă | Issei Okamura | Hiroyasu Ehara | 6-4, 6-2 | | detaliu meci | ||
| 07.05.19 | Calificare | Tsung-Hao Huang | Issei Okamura | 6-3, 1-6, 10-8 | | detaliu meci | M25 Wuhan | Hard |
| 06.05.19 | 1-a rundă de calif. | Issei Okamura | Bingyu Yu | 6-1, 6-2 | | detaliu meci | ||
| 12.04.19 | a 2-a rundă | Shuichi Sekiguchi | Issei Okamura | 6-1, 6-0 | | detaliu meci | M25 Matsuyama | Hard |
| 11.04.19 | 1-a rundă | Issei Okamura | Jumpei Yamasaki | 4-6, 7-5, 6-1 | | detaliu meci | ||
| 09.04.19 | Calificare | Issei Okamura | Shota Iino | 6-2, 6-2 | | detaliu meci | ||
| 04.04.19 | a 2-a rundă | Jumpei Yamasaki | Issei Okamura | 6-3, 6-2 | | detaliu meci | M15 Kashiwa | Hard |
| 02.04.19 | 1-a rundă | Issei Okamura | Taisei Ichikawa | 5-7, 7-5, 7-5 | | detaliu meci | ||
| 27.03.19 | 1-a rundă | Naoki Tajima | Issei Okamura | 6-3, 6-4 | | detaliu meci | M15 Tsukuba | Hard |
| 22.03.19 | Sfert de finală | Ryota Tanuma | Issei Okamura | 6-4, 6-2 | | detaliu meci | M15 Kofu | Hard |
| 21.03.19 | a 2-a rundă | Issei Okamura | Takuya Kumasaka | 6-1, 6-2 | | detaliu meci | ||
| 19.03.19 | 1-a rundă | Issei Okamura | Aoran Wang | 6-2, 4-6, 6-4 | | detaliu meci | ||
| 13.03.19 | 1-a rundă | Rimpei Kawakami | Issei Okamura | 6-2, 6-1 | | detaliu meci | M15 Nishi | Hard |
| 12.03.19 | Calificare | Issei Okamura | Hikaru Shiraishi | 6-2, 6-3 | | detaliu meci | ||
| 10.03.19 | 1-a rundă de calif. | Issei Okamura | Li-Wie Tan | 6-4, 6-0 | | detaliu meci | ||
| 25.12.18 | 1-a rundă | Issei Okamura | Yuki Mochizuki | 7-64, 7-64 | | detaliu meci | Hong Kong | Hard |
| 25.12.18 | a 2-a rundă | Riccardo Bonadio | Issei Okamura | 6-3, 7-5 | | detaliu meci | ||
| 23.12.18 | Calificare | Issei Okamura | Taisei Ichikawa | 6-2, 7-5 | | detaliu meci | ||
| 21.12.18 | 1-a rundă de calif. | Issei Okamura | Kyle Lok Yin Tang | 6-1, 6-1 | | detaliu meci | ||
| 08.10.18 | 1-a rundă | Moerani Bouzige | Issei Okamura | 7-5, 6-1 | | detaliu meci | Australia F8 | Hard |
| 04.10.18 | a 2-a rundă | Benjamin Mitchell | Issei Okamura | 6-4, 1-6, 6-1 | | detaliu meci | Australia F7 | Hard |
| 01.10.18 | 1-a rundă | Issei Okamura | Vincent Stouff | 6-4, 6-4 | | detaliu meci | ||
| 24.09.18 | 1-a rundă | Connor Farren | Issei Okamura | 3-6, 7-64, 6-2 | | detaliu meci | Australia F6 | Hard |
| 20.09.18 | a 2-a rundă | Issei Okamura | Aaron Addison | 6-2, 6-74, 6-2 | | detaliu meci | Australia F5 | Hard |
| 20.09.18 | Sfert de finală | Brydan Klein | Issei Okamura | 6-3, 6-2 | | detaliu meci | ||
| 18.09.18 | 1-a rundă | Issei Okamura | Scott Puodziunas | 7-63, 5-7, 6-4 | | detaliu meci | ||
| 11.08.18 | 1-a rundă de calif. | Jung-Woong Na | Issei Okamura | 6-3, 1-6, 6-1 | | detaliu meci | Gwangju Challenger | Hard |
| 06.08.18 | Calificare | Tak Khunn Wang | Issei Okamura | 6-1, 6-2 | | detaliu meci | Jinan Challenger | Hard |
| 05.08.18 | 2-a rundă de calif. | Issei Okamura | Chien-Hsun Lo | 7-65, 6-1 | | detaliu meci | ||
| 04.08.18 | 1-a rundă de calif. | Issei Okamura | Dzmitry Zhyrmont | 0-3, Dzmitry Zhyrmont - retragere | | detaliu meci | ||
| 28.07.18 | 1-a rundă de calif. | Blake Ellis | Issei Okamura | 4-6, 6-1, 7-5 | | detaliu meci | Chengdu Challenger | Hard |
| 25.07.18 | a 2-a rundă | Chun Hsin Tseng | Issei Okamura | 6-3, 6-4 | | detaliu meci | .png){kind=small} Chinese Taipei | Hard |
| 24.07.18 | 1-a rundă | Issei Okamura | Liang-Yu Lin | 6-2, 6-2 | | detaliu meci | ||
| 19.07.18 | a 2-a rundă | Yu Hsiou Hsu | Issei Okamura | 7-65, 7-5 | | detaliu meci | Chinese Taipei | Hard |
| 18.07.18 | 1-a rundă | Issei Okamura | Francesco Vilardo | 7-5, 6-4 | | detaliu meci | ||
| 04.07.18 | Sfert de finală | Shintaro Imai | Issei Okamura | 6-2, 6-1 | | detaliu meci | Hong Kong | Hard |
| 03.07.18 | a 2-a rundă | Issei Okamura | Sidharth Rawat | 0-6, 7-5, 6-2 | | detaliu meci | ||
| 02.07.18 | 1-a rundă | Issei Okamura | Ching Lam | 6-1, 6-4 | | detaliu meci | ||
| 27.06.18 | Sfert de finală | Hong Kit Wong | Issei Okamura | 7-5, 6-4 | | detaliu meci | Hong Kong | Hard |
| 27.06.18 | a 2-a rundă | Issei Okamura | Kazuki Nishiwaki | 6-4, Kazuki Nishiwaki - retragere | | detaliu meci | ||
| 25.06.18 | 1-a rundă | Issei Okamura | Jeson Patrombon | 6-4, 6-2 | | detaliu meci | ||
| 14.05.18 | 1-a rundă | Shi Hong Zeng | Issei Okamura | 6-2, 6-3 | | detaliu meci | China F6 | Hard |
| 08.05.18 | 1-a rundă | Lucas Vuradin | Issei Okamura | 7-60, 6-2 | | detaliu meci |  Vietnam F2 | Hard |
| 30.04.18 | 1-a rundă | Rio Noguchi | Issei Okamura | 7-5, 7-5 | | detaliu meci | Vietnam F1 | Hard |
| 09.04.18 | 1-a rundă | Kazuki Nishiwaki | Issei Okamura | 6-2, 7-5 | | detaliu meci | Japan F6 | Hard |
| 08.04.18 | 2-a rundă de calif. | Issei Okamura | Hikaru Shiraishi | 6-4, 6-3 | | detaliu meci | ||
| 08.04.18 | Calificare | Issei Okamura | Yuto Sakai | 6-2, 6-3 | | detaliu meci | ||
| 31.03.18 | 1-a rundă de calif. | Yuta Kawahashi | Issei Okamura | 6-3, 6-1 | | detaliu meci | Japan F5 | Hard |
| 26.03.18 | Calificare | Shao-Fan Liu | Issei Okamura | 6-3, 7-5 | | detaliu meci | Japan F4 | Hard |
| 25.03.18 | 2-a rundă de calif. | Issei Okamura | Takumi Gondo | 6-0, 6-1 | | detaliu meci | ||
| 24.03.18 | 1-a rundă de calif. | Issei Okamura | Kousuke Ogura | 6-3, 7-5 | | detaliu meci | ||
| 19.03.18 | 1-a rundă | Makoto Ochi | Issei Okamura | 7-66, 6-3 | | detaliu meci | Japan F3 | Hard |
| 18.03.18 | Calificare | Issei Okamura | Masaki Sasai | 6-3, 6-1 | | detaliu meci | ||
| 17.03.18 | 2-a rundă de calif. | Issei Okamura | Arata Onozawa | 7-64, 6-0 | | detaliu meci | ||
| 14.03.18 | a 2-a rundă | Kaito Uesugi | Issei Okamura | 6-4, 7-5 | | detaliu meci | Japan F2 | Hard |
| 12.03.18 | Calificare | Issei Okamura | Kaito Itsusaki | 6-4, 6-1 | | detaliu meci | ||
| 12.03.18 | 1-a rundă | Issei Okamura | Rimpei Kawakami | 6-2, 6-4 | | detaliu meci | ||
| 11.03.18 | 2-a rundă de calif. | Issei Okamura | Yasunori Hashikawa | 6-2, 6-1 | | detaliu meci | ||
| 07.03.18 | 1-a rundă | Shinji Hazawa | Issei Okamura | 3-6, 6-1, 6-3 | | detaliu meci | Japan F1 | Hard |
| 25.11.17 | Semifinală | Arjun Kadhe | Issei Okamura | 6-1, 6-1 | | detaliu meci | Vietnam F3 | Hard |
| 23.11.17 | Sfert de finală | Issei Okamura | Rio Noguchi | 6-2, 6-2 | | detaliu meci | ||
| 22.11.17 | a 2-a rundă | Issei Okamura | Michael Look | 7-65, 6-2 | | detaliu meci | ||
| 21.11.17 | 1-a rundă | Issei Okamura | Yan Sabanin | 6-4, 6-1 | | detaliu meci | ||
| 09.10.17 | 2-a rundă de calif. | Issei Okamura | Remy Bertola | 3-6, 6-3, 7-64 | | detaliu meci | Thailand F8 | Hard |
| 09.10.17 | Calificare | Riccardo Balzerani | Issei Okamura | 6-3, 6-1 | | detaliu meci | ||
| 02.10.17 | 2-a rundă de calif. | Issei Okamura | Jirat Navasirisomboon | 6-3, 6-1 | | detaliu meci | Thailand F7 | Hard |
| 02.10.17 | Calificare | Matteo Martineau | Issei Okamura | 4-6, 7-63, 6-2 | | detaliu meci | ||
| 07.08.17 | 1-a rundă | Jacob Grills | Issei Okamura | 6-3, 6-4 | | detaliu meci | Thailand F5 | Hard |
| 01.08.17 | 1-a rundă | Calum Puttergill | Issei Okamura | 7-5, 0-6, 6-4 | | detaliu meci | Thailand F4 | Hard |
| 28.07.17 | Sfert de finală | Nikola Milojevic | Issei Okamura | 6-2, 6-1 | | detaliu meci | China F14 | Hard |
| 27.07.17 | a 2-a rundă | Issei Okamura | Francis Casey Alcantara | 4-6, 7-5, 6-2 | | detaliu meci | ||
| 24.07.17 | 1-a rundă | Issei Okamura | Kento Takeuchi | 6-2, 6-2 | | detaliu meci | ||
| 18.07.17 | 1-a rundă | Jui-Chen Hung | Issei Okamura | 6-4, 6-2 | | detaliu meci | China F13 | Hard |
| 21.06.17 | 1-a rundă | Takao Suzuki | Issei Okamura | 7-5, 6-4 | | detaliu meci | Guam F1 | Hard |
| 07.06.17 | a 2-a rundă | Haru Inoue | Issei Okamura | 7-64, 6-2 | | detaliu meci | Japan F7 | Hard |
| 06.06.17 | 1-a rundă | Issei Okamura | Masato Shiga | 6-4, Masato Shiga - retragere | | detaliu meci | ||
| 25.05.17 | 1-a rundă | Kazuki Nishiwaki | Issei Okamura | 7-63, 6-1 | | detaliu meci |  Singapore F1 | Hard |
| 16.05.17 | 1-a rundă | Yusuke Takahashi | Issei Okamura | 5-7, 6-2, 6-4 | | detaliu meci | China F7 | Hard |
| 10.05.17 | a 2-a rundă | Dayne Kelly | Issei Okamura | 6-4, 6-3 | | detaliu meci | China F6 | Hard |
| 08.05.17 | 1-a rundă | Issei Okamura | Ruikai Wang | 6-3, 6-1 | | detaliu meci | ||
| 03.04.17 | 1-a rundă | Takao Suzuki | Issei Okamura | 7-63, 6-3 | | detaliu meci | Japan F5 | Hard |
| 28.03.17 | 1-a rundă | Kaito Uesugi | Issei Okamura | 6-3, 6-3 | | detaliu meci | Japan F4 | Hard |
| 22.03.17 | a 2-a rundă | Shane Vinsant | Issei Okamura | 6-2, 6-3 | | detaliu meci | Japan F3 | Hard |
| 20.03.17 | 1-a rundă | Issei Okamura | Daisuke Sumizawa | 6-2, 6-2 | | detaliu meci | ||
| 13.03.17 | 1-a rundă | Nam Hoang Ly | Issei Okamura | 6-2, 6-2 | | detaliu meci | Japan F2 | Hard |
| 07.03.17 | 1-a rundă | Yuki Mochizuki | Issei Okamura | 6-2, 6-4 | | detaliu meci | Japan F1 | Hard |
| 04.02.17 | 2-a rundă de calif. | Zach Itzstein | Issei Okamura | 3-6, 6-4, 7-67 | | detaliu meci | Launceston Challenger | Hard |
| 28.01.17 | 2-a rundă de calif. | Dane Propoggia | Issei Okamura | 6-4, 6-2 | | detaliu meci | Burnie Challenger | Hard |
| 28.01.17 | 1-a rundă de calif. | Issei Okamura | Jeremy Beale | 1-6, 6-3, 6-2 | | detaliu meci | ||
| 20.12.16 | 1-a rundă | Wishaya Trongcharoenchaikul | Issei Okamura | 6-2, 7-67 | | detaliu meci | Thailand F5 | Hard |
| 13.12.16 | 1-a rundă | Kittiphong Wachiramanowong | Issei Okamura | 6-0, 6-0 | | detaliu meci | Thailand F4 | Hard |
| 07.12.16 | 1-a rundă | David Agung Susanto | Issei Okamura | 6-1, 6-4 | | detaliu meci | Indonesia F5 | Hard |
| 30.11.16 | 1-a rundă | Shintaro Imai | Issei Okamura | 5-5, Issei Okamura - retragere | | detaliu meci | Indonesia F4 | Hard |
| 11.10.16 | 1-a rundă | Tung-Lin Wu | Issei Okamura | 6-2, 3-6, 6-2 | | detaliu meci | Chinese Taipei | Hard |
| 22.09.16 | a 2-a rundă | Shinta Fujii | Issei Okamura | 6-3, 7-63 | | detaliu meci | Vietnam F5 | Hard |
| 20.09.16 | 1-a rundă | Issei Okamura | Ren Nakamura | 6-2, 6-3 | | detaliu meci | ||
| 16.09.16 | Sfert de finală | Yuichi Ito | Issei Okamura | 6-2, 4-6, 6-4 | | detaliu meci | Vietnam F4 | Hard |
| 15.09.16 | a 2-a rundă | Issei Okamura | Seungri Choi | 6-4, 6-3 | | detaliu meci | ||
| 13.09.16 | 1-a rundă | Issei Okamura | Chan-Yeong Oh | 7-66, 6-3 | | detaliu meci | ||
| 07.09.16 | a 2-a rundă | Jumpei Yamasaki | Issei Okamura | 4-6, 6-2, 6-4 | | detaliu meci | Thailand F3 | Hard |
| 04.09.16 | 1-a rundă | Issei Okamura | Natthasith Kunsuwan | 6-2, 6-4 | | detaliu meci | ||
| 28.08.16 | 1-a rundă | Renta Tokuda | Issei Okamura | 6-4, 6-1 | | detaliu meci | Thailand F2 | Hard |
| 24.08.16 | a 2-a rundă | Issei Okamura | Phassawit Burapharitta | 6-3, 6-4 | | detaliu meci | Thailand F1 | Hard |
| 24.08.16 | Sfert de finală | Ti Chen | Issei Okamura | 6-1, 6-0 | | detaliu meci | ||
| 21.08.16 | 1-a rundă | Issei Okamura | N. Vijay Sundar Prashanth | 6-2, 4-6, 6-4 | | detaliu meci | ||
| 05.06.16 | 1-a rundă | Kento Takeuchi | Issei Okamura | 6-2, 6-3 | | detaliu meci | Japan F7 | Hard |
| 25.05.16 | 1-a rundă | Bernabe Zapata Miralles | Issei Okamura | 6-3, 6-2 | | detaliu meci |  Spain F15 | Hard |
| 06.05.16 | Sfert de finală | Hugo Nys | Issei Okamura | 6-0, 6-3 | | detaliu meci |  Turkey F18 | Hard |
| 05.05.16 | a 2-a rundă | Issei Okamura | Mikelis Libietis | 6-3, 6-2 | | detaliu meci | ||
| 03.05.16 | 1-a rundă | Issei Okamura | Marcelo Tebet Filho | 7-5, 6-4 | | detaliu meci | ||
| 28.04.16 | a 2-a rundă | Marc Sieber | Issei Okamura | 5-7, 6-2, 6-0 | | detaliu meci | Turkey F17 | Hard |
| 26.04.16 | 1-a rundă | Issei Okamura | Marek Jaloviec | 2-6, 7-64, 6-2 | | detaliu meci | ||
| 14.04.16 | a 2-a rundă | Shuichi Sekiguchi | Issei Okamura | 6-2, 6-2 | | detaliu meci | China F5 | Hard |
| 12.04.16 | 1-a rundă | Issei Okamura | Aoran Wang | 6-3, 6-1 | | detaliu meci | ||
| 05.04.16 | 1-a rundă | Yuya Ito | Issei Okamura | 6-0, 6-3 | | detaliu meci | Japan F5 | Hard |
| 31.03.16 | a 2-a rundă | Finn Tearney | Issei Okamura | 6-3, 6-2 | | detaliu meci | Japan F4 | Hard |
| 30.03.16 | 1-a rundă | Issei Okamura | Kittiphong Wachiramanowong | 6-4, 6-2 | | detaliu meci | ||
| 17.03.16 | a 2-a rundă | Sidharth Rawat | Issei Okamura | 6-4, 1-6, 7-64 | | detaliu meci | Japan F2 | Hard |
| 15.03.16 | 1-a rundă | Issei Okamura | Young Seok Kim | 6-76, 6-3, 6-4 | | detaliu meci | ||
| 12.03.16 | Semifinală | Liang-Chi Huang | Issei Okamura | 6-3, 6-4 | | detaliu meci | Japan F1 | Hard |
| 11.03.16 | Sfert de finală | Issei Okamura | Karunuday Singh | 6-3, 6-2 | | detaliu meci | ||
| 10.03.16 | a 2-a rundă | Issei Okamura | Sidharth Rawat | 6-2, 6-4 | | detaliu meci | ||
| 09.03.16 | 1-a rundă | Issei Okamura | Kento Takeuchi | 7-63, 7-61 | | detaliu meci | ||
| 12.02.16 | Sfert de finală | Seong Chan Hong | Issei Okamura | 5-7, 6-4, 6-3 | | detaliu meci | Turkey F6 | Hard |
| 11.02.16 | a 2-a rundă | Issei Okamura | Patrik Nema | 6-1, 7-5 | | detaliu meci | ||
| 09.02.16 | 1-a rundă | Issei Okamura | Maxime Pauwels | 3-6, 6-3, 6-3 | | detaliu meci | ||
| 04.02.16 | a 2-a rundă | Lenny Hampel | Issei Okamura | 1-6, 6-0, 7-67 | | detaliu meci | Turkey F5 | Hard |
| 02.02.16 | 1-a rundă | Issei Okamura | Mert Zincirli | 6-4, 6-2 | | detaliu meci | ||
| 25.01.16 | 2-a rundă de calif. | Issei Okamura | Peter Balla | 6-2, 6-2 | | detaliu meci | Turkey F4 | Hard |
| 25.01.16 | Calificare | Ryota Kishi | Issei Okamura | 6-2, 2-6, 6-1 | | detaliu meci | ||
| 30.11.15 | 1-a rundă | Issei Okamura | Warit Sornbutnark | 6-2, 6-2 | | detaliu meci | Thailand F9 | Hard |
| 30.11.15 | a 2-a rundă | Kittiphong Wachiramanowong | Issei Okamura | 3-6, 6-4, 6-3 | | detaliu meci | ||
| 23.11.15 | 1-a rundă | Pruchya Isarow | Issei Okamura | 6-2, 6-4 | | detaliu meci | Thailand F8 | Hard |
| 16.11.15 | a 2-a rundă | Dayne Kelly | Issei Okamura | 6-4, 6-0 | | detaliu meci | Australia F11 | Hard |
| 16.11.15 | 1-a rundă | Issei Okamura | Adam Taylor | 7-5, 3-6, 7-63 | | detaliu meci | ||
| 09.11.15 | 1-a rundă | Harry Bourchier | Issei Okamura | 6-2, 6-72, 6-3 | | detaliu meci | Australia F10 | Hard |
| 29.08.15 | 1-a rundă de calif. | Sho Katayama | Issei Okamura | 6-1, 6-1 | | detaliu meci | Bangkok Challenger | Hard |
| 24.08.15 | 1-a rundă | Issei Okamura | Shao-Fan Liu | 6-3, 6-4 | | detaliu meci | Chinese Taipei | Hard |
| 24.08.15 | a 2-a rundă | Yan Bai | Issei Okamura | 6-2, 6-1 | | detaliu meci | ||
| 17.08.15 | Calificare | Issei Okamura | Wen-Yao Liang | 6-2, 6-0 | | detaliu meci | Chinese Taipei | Hard |
| 17.08.15 | a 2-a rundă | Issei Okamura | Masato Shiga | 6-4, 6-4 | | detaliu meci | ||
| 17.08.15 | 1-a rundă | Issei Okamura | Chieh-Fu Wang | 6-77, 6-2, 2-0, Chieh-Fu Wang - retragere | | detaliu meci | ||
| 17.08.15 | Sfert de finală | Issei Okamura | Ryota Tanuma | 6-4, 3-6, 6-3 | | detaliu meci | ||
| 17.08.15 | Semifinală | Tsung-Hua Yang | Issei Okamura | 6-0, 6-1 | | detaliu meci | ||
| 17.08.15 | 1-a rundă de calif. | Issei Okamura | Chak Yin Chan | 6-2, 7-60 | | detaliu meci | ||
| 10.08.15 | Calificare | Issei Okamura | Roy Hobbs | 6-2, 6-1 | | detaliu meci | Thailand F7 | Hard |
| 10.08.15 | 1-a rundă | Daniel Hobart | Issei Okamura | 6-2, 6-4 | | detaliu meci | ||
| 10.08.15 | 1-a rundă de calif. | Issei Okamura | Rapeephat Waewboot | 6-3, 6-3 | | detaliu meci | ||
| 03.08.15 | Sfert de finală | Vishnu Vardhan | Issei Okamura | 6-3, 6-4 | | detaliu meci | Thailand F6 | Hard |
| 03.08.15 | 1-a rundă de calif. | Issei Okamura | Aditya Deswal | 6-2, 6-2 | | detaliu meci | ||
| 03.08.15 | Calificare | Issei Okamura | Thuwanon Pattananawapong | 6-1, 6-1 | | detaliu meci | ||
| 03.08.15 | 1-a rundă | Issei Okamura | Shao-Fan Liu | 6-4, 6-2 | | detaliu meci | ||
| 03.08.15 | a 2-a rundă | Issei Okamura | Jirat Navasirisomboon | 7-64, 7-5 | | detaliu meci | ||
| 22.06.15 | Calificare | Issei Okamura | Teeradon Tortrakul | 6-74, 6-4, 6-1 | | detaliu meci | Thailand F5 | Hard |
| 22.06.15 | a 2-a rundă | Hiroki Kondo | Issei Okamura | 6-1, 6-2 | | detaliu meci | ||
| 22.06.15 | 1-a rundă | Issei Okamura | Ken Onishi | 6-4, 2-6, 6-1 | | detaliu meci | ||
| 15.06.15 | Calificare | Zach Itzstein | Issei Okamura | 3-6, 7-5, 7-5 | | detaliu meci | Thailand F4 | Hard |
| 15.06.15 | 1-a rundă de calif. | Issei Okamura | Chirayu Limpatum | 6-1, 6-1 | | detaliu meci | ||
| 08.06.15 | 2-a rundă de calif. | Issei Okamura | Hiroki Yamaguchi | 6-0, 6-0 | | detaliu meci | Japan F6 | Hard |
| 08.06.15 | a 2-a rundă | Duckhee Lee | Issei Okamura | 6-1, 6-4 | | detaliu meci | ||
| 08.06.15 | Calificare | Issei Okamura | Yuichiro Inui | 6-3, 6-1 | | detaliu meci | ||
| 08.06.15 | 1-a rundă | Issei Okamura | Koichi Sano | 6-2, 6-4 | | detaliu meci | ||
| 04.05.15 | 1-a rundă de calif. | Issei Okamura | Ken Onoda | 6-2, 6-4 | | detaliu meci | Thailand F3 | Hard |
| 04.05.15 | Calificare | Issei Okamura | Kelsey Stevenson | 7-60, 6-4 | | detaliu meci | ||
| 04.05.15 | 1-a rundă | Issei Okamura | Sidharth Rawat | 6-4, 5-7, 7-611 | | detaliu meci | ||
| 04.05.15 | a 2-a rundă | Tyler Hochwalt | Issei Okamura | 6-3, 1-6, 6-2 | | detaliu meci | ||
| 27.04.15 | 1-a rundă de calif. | Andre Dome | Issei Okamura | 6-1, 6-2 | | detaliu meci | Thailand F2 | Hard |
| 20.04.15 | 2-a rundă de calif. | Issei Okamura | Jun Nan Tao | 6-4, 6-4 | | detaliu meci | China F4 | Hard |
| 20.04.15 | 1-a rundă | Chuhan Wang | Issei Okamura | 6-4, 6-4 | | detaliu meci | ||
| 20.04.15 | Calificare | Issei Okamura | Ruikai Wang | 6-3, 6-4 | | detaliu meci | ||
| 30.03.15 | 1-a rundă de calif. | Issei Okamura | Taiki Hashimoto | 6-73, 6-1, 6-1 | | detaliu meci | Japan F4 | Hard |
| 30.03.15 | 2-a rundă de calif. | Seong Chan Hong | Issei Okamura | 6-3, 6-3 | | detaliu meci | ||
| 23.03.15 | 1-a rundă de calif. | Issei Okamura | Keisuke Watanuki | 6-2, 6-3 | | detaliu meci | Japan F3 | Hard |
| 23.03.15 | 2-a rundă de calif. | David Sofaer | Issei Okamura | 6-4, 7-5 | | detaliu meci | ||
| 16.03.15 | 1-a rundă de calif. | Issei Okamura | Yuma Otomo | 6-2, 6-3 | | detaliu meci | Japan F2 | Hard |
| 16.03.15 | Calificare | Masaki Sasai | Issei Okamura | 6-3, 6-0 | | detaliu meci | ||
| 09.03.15 | 1-a rundă de calif. | Issei Okamura | Yusuke Yoshikawa | 6-0, 6-2 | | detaliu meci | Japan F1 | Hard |
| 09.03.15 | 2-a rundă de calif. | Issei Okamura | Takahiro Inoue | 6-3, 6-2 | | detaliu meci | ||
| 09.03.15 | Calificare | Shintaro Imai | Issei Okamura | 6-0, 6-1 | | detaliu meci | ||
| 07.02.15 | 2-a rundă de calif. | Alexander Sarkissian | Issei Okamura | 6-1, 6-1 | | detaliu meci | Launceston Challenger | Hard |
| 31.01.15 | 1-a rundă de calif. | Issei Okamura | Alexander Klintcharov | 6-2, 5-7, 7-5 | | detaliu meci | Burnie Challenger | Hard |
| 31.01.15 | 2-a rundă de calif. | Andrew Whittington | Issei Okamura | 6-1, 6-1 | | detaliu meci | ||
| 08.11.14 | 2-a rundă de calif. | Ji Sung Nam | Issei Okamura | 6-2, 6-0 | | detaliu meci | Yokohama Challenger | Hard |
| 07.11.14 | 1-a rundă de calif. | Issei Okamura | Ginjiro Yamasaki | 6-1, 6-0 | | detaliu meci | ||
| 31.03.14 | 1-a rundă | Issei Okamura | Yuichi Ito | 6-74, 6-2, 7-64 | | detaliu meci | Japan F4 | Hard |
| 31.03.14 | a 2-a rundă | Issei Okamura | Masaki Sasai | 6-3, 6-3 | | detaliu meci | ||
| 31.03.14 | Sfert de finală | Masato Shiga | Issei Okamura | 6-0, 6-3 | | detaliu meci | ||
| 24.03.14 | 1-a rundă | Issei Okamura | Wishaya Trongcharoenchaikul | 6-4, 6-2 | | detaliu meci | Japan F3 | Hard |
| 24.03.14 | a 2-a rundă | Yuuya Kibi | Issei Okamura | 6-1, 6-1 | | detaliu meci | ||
| 17.03.14 | 1-a rundă | Yuuya Kibi | Issei Okamura | 6-1, 6-3 | | detaliu meci | Japan F2 | Hard |
| 10.03.14 | 1-a rundă de calif. | Issei Okamura | Wataru Matsumoto | 6-1, 6-0 | | detaliu meci | Japan F1 | Hard |
| 10.03.14 | 2-a rundă de calif. | Koichi Sano | Issei Okamura | 4-6, 7-5, 6-3 | | detaliu meci | ||
| 01.07.13 | 1-a rundă | Issei Okamura | Keita Koyama | 6-1, Keita Koyama - retragere | | detaliu meci | Japan F8 | Hard |
| 01.07.13 | a 2-a rundă | Zhaoyi Cao | Issei Okamura | 6-2, 6-3 | | detaliu meci | ||
| 01.04.13 | Semifinală | Issei Okamura | Takuto Niki | 7-65, 2-6, 6-4 | | detaliu meci | Japan F4 | Hard |
| 01.04.13 | 1-a rundă | Issei Okamura | Sho Katayama | 7-5, 6-4 | | detaliu meci | ||
| 01.04.13 | Finală | Yuichi Ito | Issei Okamura | 6-3, 3-6, 6-2 | | detaliu meci | ||
| 01.04.13 | a 2-a rundă | Issei Okamura | Keita Koyama | 7-64, 7-62 | | detaliu meci | ||
| 01.04.13 | Sfert de finală | Issei Okamura | Gengo Kikuchi | 6-4, 6-2 | | detaliu meci | ||
| 25.03.13 | 1-a rundă de calif. | Issei Okamura | Soutatsu Mochizuki | 6-2, 6-1 | | detaliu meci | Japan F3 | Hard |
| 25.03.13 | a 2-a rundă | Hiroyasu Ehara | Issei Okamura | 6-4, 6-2 | | detaliu meci | ||
| 25.03.13 | 2-a rundă de calif. | Issei Okamura | Takumi Hernandez | 3-6, 6-1, 6-2 | | detaliu meci | ||
| 25.03.13 | Calificare | Min-Kyu Song | Issei Okamura | 6-1, 6-4 | | detaliu meci | ||
| 25.03.13 | 1-a rundă | Issei Okamura | Hiromasa Oku | 7-66, 6-74, 7-62 | | detaliu meci | ||
| 18.03.13 | 1-a rundă de calif. | Issei Okamura | Ryota Kobori | 6-3, 4-6, 6-1 | | detaliu meci | Japan F2 | Hard |
| 18.03.13 | Calificare | Issei Okamura | Jae-Min Seol | 6-3, 6-4 | | detaliu meci | ||
| 18.03.13 | 1-a rundă | Jung-Woong Na | Issei Okamura | 6-4, 6-2 | | detaliu meci | ||
| 11.03.13 | Calificare | Masaki Sasai | Issei Okamura | 6-1, 6-2 | | detaliu meci | Japan F1 | Hard |
| 11.03.13 | 2-a rundă de calif. | Issei Okamura | Takeshi Endo | 6-2, 6-1 | | detaliu meci | ||
| 11.03.13 | 1-a rundă de calif. | Issei Okamura | Toma Kozakai | 6-3, 6-4 | | detaliu meci | ||
| 08.10.12 | a 2-a rundă | Shota Tagawa | Issei Okamura | 6-1, 7-67 | | detaliu meci | Japan F8 | Hard |
| 08.10.12 | 1-a rundă | Issei Okamura | Yuuya Kibi | 3-6, 7-62, 6-2 | | detaliu meci |
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