Round: 25 Ground: Hardcourt outdoor
| ITF Japan F8 | 2016/06/15 06:25 | Issei Okamura v Yusuke Takahashi | 3-6,0-6 |
| Challenger Launceston Qual | 2017/02/04 01:25 | Issei Okamura v Zach Itzstein | 6-3,4-6,6-7 |
| Challenger Burnie Qual | 2017/01/28 04:10 | Dane Propoggia v Issei Okamura | 6-4,6-2 |
| Challenger Burnie Qual | 2017/01/27 23:00 | Jeremy Beale v Issei Okamura | 6-1,3-6,2-6 |
| ITF Thailand F5 | 2016/12/20 03:00 | Wishaya Trongcharoenchaikul v Issei Okamura | 6-2,7-6 |
| ITF Thailand F4 | 2016/12/13 03:00 | Kittiphong Wachiramanowong v Issei Okamura | 6-0,6-0 |
| ITF Indonesia F5 | 2016/12/07 07:10 | David Agung Susanto v Issei Okamura | 6-1,6-4 |
| Others | 2016/11/12 07:00 | Issei Okamura v Sergey Betov | 6-4,5-7,3-6 |
| Others | 2016/11/12 04:30 | Issei Okamura v Soichiro Moritani | 7-5,6-2 |
| ITF USA F6 | 2017/02/02 15:00 | Yusuke Takahashi v Naoki Nakagawa | 6-7,3-6 |
| ITF USA F6 | 2017/01/31 15:00 | Yusuke Takahashi v Diego Hidalgo | 4-6,6-0,7-5 |
| ITF USA F5 | 2017/01/24 15:00 | Peter Nagy v Yusuke Takahashi | 6-4,6-4 |
| ITF USA F4 | 2017/01/18 15:00 | Yusuke Takahashi v Miomir Kecmanovic | 1-6,2-6 |
| ITF Indonesia F5 | 2016/12/11 05:10 | Yusuke Takahashi v Enzo Couacaud | 3-6,2-6 |
| ITF Indonesia F5 | 2016/12/10 05:20 | Shintaro Imai v Yusuke Takahashi | 2-6,4-6 |
| ITF Indonesia F5 | 2016/12/09 04:45 | Yusuke Takahashi v Kento Takeuchi | 6-0,6-3 |
| ITF Indonesia F5 | 2016/12/08 05:15 | Yusuke Takahashi v Jake Delaney | 6-2,6-4 |