Round: 25 Ground: Hardcourt outdoor
| ITF Japan F5 | 2017/04/04 00:30 | Issei Okamura v Takao Suzuki | 6-7,3-6 |
| ITF Japan F5 | 2017/04/05 00:30 | Takao Suzuki v Yusuke Watanuki | 2-6,1-6 |
| ITF Japan F5 | 2017/04/04 00:30 | Issei Okamura v Takao Suzuki | 6-7,3-6 |
| ITF Japan F5 | 2017/04/02 01:00 | Rio Noguchi v Takao Suzuki | 6-7,7-6,4-6 |
| ITF Japan F5 | 2017/04/01 02:00 | Yuga Tashiro v Takao Suzuki | 1-6,4-6 |
| ITF Japan F2 | 2017/03/13 01:00 | Jeamoon Lee v Takao Suzuki | 6-4,6-0 |
| ITF Guam F1 | 2016/05/25 02:30 | Deiton Baughman v Takao Suzuki | 6-3,6-2 |
| ITF Japan F5 | 2016/04/06 00:30 | Ken Onishi v Takao Suzuki | 6-3,4-6,3-6 |
| ITF Japan F3 | 2016/03/19 03:45 | Takao Suzuki v Brandon Walkin | 6-2,6-2 |
| 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 |