| 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 |
| Others | 2016/11/05 02:00 | Issei Okamura v Masato Shiga | 3-6,1-6 |
| Others | 2016/11/05 04:05 | Kazuki Nishiwaki v Kento Takeuchi | 0-6,2-6 |
| ITF Japan F8 | 2016/06/16 02:50 | Gengo Kikuchi v Kazuki Nishiwaki | 7-6,6-4 |
| ITF Japan F8 | 2016/06/15 04:30 | Kazuki Nishiwaki v Hiromasa Oku | 2-6,6-3,6-4 |
| ITF Japan F4 | 2015/03/28 00:30 | Yutaro Matsuzaki v Kazuki Nishiwaki | 6-7,6-4,6-4 |
| ITF Japan F2 | 2015/03/14 00:30 | Ryota Tanuma v Kazuki Nishiwaki | 6-4,6-4 |
| ITF Japan F6 Qual | 2014/06/09 03:00 | Shohei Chikami v Kazuki Nishiwaki | 6-0,6-3 |
| ITF Japan F5 | 2014/06/04 03:35 | Kazuki Nishiwaki v Jui-Chen Hung | 4-6,6-7 |
| ITF Japan F5 | 2014/06/03 01:00 | Shunrou Takeshima v Kazuki Nishiwaki | 6-3,5-7,3-6 |