Round: 26 Ground: Hardcourt outdoor
| ITF Japan F4 | 2014/04/04 01:00 | Issei Okamura v Masato Shiga | 0-6,3-6 |
| ITF China F13 | 2015/08/14 02:00 | Masato Shiga v Di Wu | 0-6,6-7 |
| ITF China F13 | 2015/08/13 02:00 | Jui-Chen Hung v Masato Shiga | 7-6,6-7,1-6 |
| ITF China F13 | 2015/08/11 06:00 | Zihao Xia v Masato Shiga | 6-7,6-7 |
| ITF China F12 | 2015/08/08 02:00 | Yan Bai v Masato Shiga | 6-2,6-2 |
| ITF China F12 | 2015/08/07 07:00 | Yuqing Ning v Masato Shiga | 0-6,3-6 |
| ITF China F12 | 2015/08/06 08:00 | Masato Shiga v Tsung-Hua Yang | 2-6,6-4,7-5 |
| ITF China F12 | 2015/08/04 08:00 | Yuanfeng Li v Masato Shiga | 5-7,3-6 |
| ITF China F12 Qual | 2015/08/03 01:30 | Masato Shiga v Long Chen | 6-1,6-1 |
| ITF Thailand F9 | 2015/08/11 08:20 | Daniel Hobart v Issei Okamura | 6-2,6-4 |
| ITF Thailand F9 | 2015/08/09 05:35 | Roy Hobbs v Issei Okamura | 2-6,1-6 |
| ITF Thailand F9 | 2015/08/06 03:00 | Issei Okamura v Vishnu Vardhan | 3-6,4-6 |
| ITF Thailand F9 | 2015/08/05 05:10 | Jirat Navasirisomboon v Issei Okamura | 6-7,5-7 |
| ITF Thailand F9 | 2015/08/04 08:00 | Shao-Fan Liu v Issei Okamura | 4-6,2-6 |
| ITF Thailand F9 | 2015/08/01 05:00 | Issei Okamura v Aditya Deswal | 6-2,6-2 |
| ITF Thailand F9 | 2015/06/24 04:30 | Issei Okamura v Hiroka Kondo | 1-6,2-6 |
| ITF Thailand F9 | 2015/06/23 06:40 | Issei Okamura v Ken Onishi | 6-4,2-6,6-1 |