Round: 25 Ground: Synthetic outdoor
| Others | 2016/11/05 02:00 | Issei Okamura v Shiga, Masato | 3-6,1-6 |
| ITF Chinese Taipei F1 | 2015/08/20 03:30 | Shiga, Masato v Issei Okamura | 4-6,4-6 |
| ITF Japan F4 | 2014/04/04 01:00 | Issei Okamura v Shiga, Masato | 0-6,3-6 |
| ITF Singapore F2 | 2017/06/02 02:00 | Shiga, Masato v Prashanth, N. Vijay Sundar | 0-6,2-6 |
| ITF Singapore F2 | 2017/06/01 04:25 | Shiga, Masato v Look, Michael | 6-3,6-3 |
| ITF Singapore F2 | 2017/06/01 02:00 | Shiga, Masato v Look, Michael | 6-3,6-3 |
| ITF Singapore F2 | 2017/05/30 10:00 | Shiga, Masato v Chandrasekar, Anirudh | 6-4,6-0 |
| ITF Singapore F1 | 2017/05/25 02:00 | Ehara, Hiroyasu v Shiga, Masato | 6-1,6-0 |
| ITF Singapore F1 | 2017/05/23 02:00 | Hobbs, Roy v Shiga, Masato | 3-6,2-6 |
| ITF China F7 | 2017/05/15 06:20 | Shiga, Masato v Marcos Giron | 1-6,4-6 |
| ITF China F6 | 2017/05/12 02:30 | Wishaya Trongcharoenchaikul v Shiga, Masato | 6-4,7-6 |
| ITF Japan F6 | 2017/05/30 03:55 | Takeuchi, Kento (1987) 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 | Kelly, Dayne 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 Molchanov, Denys | 6-4,3-6,4-6 |
| Challenger Taipei Qual | 2017/04/17 04:35 | Roelofse, Ruan v Issei Okamura | 6-4,6-2 |
| Challenger Taipei Qual | 2017/04/16 05:55 | Liu, Shao-Fan v Issei Okamura | 6-7,6-4,3-6 |