Stadium: Court F Round: 45
| ITF Japan F8 | 2017/06/13 01:30 | Shunrou Takeshima v Issei Okamura | 6-3,7-5 |
| ITF Japan F7 | 2017/06/07 03:35 | Issei Okamura v Haru Inoue | 6-7,2-6 |
| ITF Japan F6 | 2017/05/30 03:55 | Kento Takeuchi v Issei Okamura | 7-6,6-3 |
| ITF Singapore F1 | 2017/05/25 02:00 | Issei Okamura v Kazuki Nishiwaki | 6-7,1-6 |
| ITF China F7 | 2017/05/16 07:00 | Issei Okamura v Yusuke Takahashi | 7-5,2-6,4-6 |
| ITF China F6 | 2017/05/10 06:05 | Dayne Kelly v Issei Okamura | 6-4,6-3 |
| ITF China F6 | 2017/05/08 05:30 | Ruikai Wang v Issei Okamura | 3-6,1-6 |
| Challenger Anning Qual | 2017/04/22 03:35 | Issei Okamura v Denys Molchanov | 6-4,3-6,4-6 |
| ITF Chinese Taipei F1 | 2017/06/15 03:00 | Takuto Niki v Yosuke Watanuki | 2-6,3-6 |
| ITF Chinese Taipei F1 | 2017/06/14 03:40 | Takuto Niki v Shintaro Imai | 6-4,6-4 |
| ITF Japan F7 | 2017/06/09 01:00 | Takuto Niki v Kento Takeuchi | 4-6,6-2,4-6 |
| ITF Japan F7 | 2017/06/06 01:00 | Takuto Niki v Yusuke Watanuki | 5-7,7-5,6-4 |
| ITF Japan F6 | 2017/06/02 04:00 | Takuto Niki v Sora Fukuda | 6-3,4-6,3-6 |
| ITF Japan F6 | 2017/06/01 02:00 | Takuto Niki v Masaya Kobayashi | 6-2,6-3 |
| ITF Japan F6 | 2017/05/31 01:00 | Takuto Niki v Masaya Kobayashi | 6-2,6-3 |
| ITF Japan F6 | 2017/05/30 03:30 | Takuto Niki v Ibuki Furuta | 6-2,6-2 |