Round: 25 Ground: Synthetic outdoor
| Others | 2016/11/05 02:00 | Issei Okamura v Masato Shiga | 3-6,1-6 |
| ITF Chinese Taipei F1 | 2015/08/20 03:30 | Masato Shiga v Issei Okamura | 4-6,4-6 |
| ITF Japan F4 | 2014/04/04 01:00 | Issei Okamura v Masato Shiga | 0-6,3-6 |
| ITF Singapore F2 | 2017/06/02 02:00 | Masato Shiga v N. Vijay Sundar Prashanth | 0-6,2-6 |
| ITF Singapore F2 | 2017/06/01 04:25 | Masato Shiga v Michael Look | 6-3,6-3 |
| ITF Singapore F2 | 2017/06/01 02:00 | Masato Shiga v Michael Look | 6-3,6-3 |
| ITF Singapore F2 | 2017/05/30 10:00 | Masato Shiga v Anirudh Chandrasekar | 6-4,6-0 |
| ITF Singapore F1 | 2017/05/25 02:00 | Hiroyasu Ehara v Masato Shiga | 6-1,6-0 |
| ITF Singapore F1 | 2017/05/23 02:00 | Roy Hobbs v Masato Shiga | 3-6,2-6 |
| ITF China F7 | 2017/05/15 06:20 | Masato Shiga v Marcos Giron | 1-6,4-6 |
| ITF China F6 | 2017/05/12 02:30 | Wishaya Trongcharoenchaikul v Masato Shiga | 6-4,7-6 |
| 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 |
| Challenger Taipei Qual | 2017/04/17 04:35 | Ruan Roelofse v Issei Okamura | 6-4,6-2 |
| Challenger Taipei Qual | 2017/04/16 05:55 | Shao-Fan Liu v Issei Okamura | 6-7,6-4,3-6 |