Stadium: Court 1 Round: 26 Ground: Hardcourt outdoor
| ITF China F13 | 2016/07/22 05:20 | Ryota Tanuma v Issei Okamura | 3-6,6-7 |
| ITF Spain F14 | 2016/05/16 09:00 | Issei Okamura v Ryota Tanuma | 0-6,3-6 |
| ITF Chinese Taipei F1 | 2015/08/21 02:00 | Issei Okamura v Ryota Tanuma | 6-4,3-6,6-3 |
| ITF Japan F5 | 2015/06/01 04:10 | Issei Okamura v Ryota Tanuma | 6-7,4-6 |
| ITF China F1 | 2018/01/09 05:00 | Ryota Tanuma v Tyler Lu | 6-4,6-3 |
| ITF Thailand F12 Qual | 2017/12/10 03:00 | Ryota Tanuma v Ji Sung Nam | 4-6,2-6 |
| ITF Thailand F11 | 2017/12/05 03:30 | Frederik Nielsen v Ryota Tanuma | 7-6,7-5 |
| ITF Thailand F11 Qual | 2017/12/04 04:35 | Vadym Ursu v Ryota Tanuma | 1-6,1-6 |
| ITF Thailand F11 Qual | 2017/12/03 03:00 | Edward Bourchier v Ryota Tanuma | 2-6,2-6 |
| ITF Thailand F10 | 2017/11/28 03:00 | Ryota Tanuma v Borna Gojo | 2-6,3-6 |
| ITF Thailand F10 Qual | 2017/11/27 03:00 | Ryota Tanuma v Congsup Congcar | 6-4,6-4 |
| ITF Thailand F10 Qual | 2017/11/26 07:00 | Ryota Tanuma v Cheong Hwi Kim | 6-0,6-0 |
| ITF China F1 | 2018/01/09 04:50 | Issei Okamura v Lingxi Zhao | 3-6,6-3,6-4 |
| ITF Vietnam F3 | 2017/11/25 03:00 | Issei Okamura v Arjun Kadhe | 1-6,1-6 |
| ITF Vietnam F3 | 2017/11/24 03:00 | Rio Noguchi v Issei Okamura | 2-6,2-6 |
| ITF Vietnam F3 | 2017/11/22 03:00 | Michael Look v Issei Okamura | 6-7,2-6 |
| ITF Vietnam F3 | 2017/11/21 04:30 | Issei Okamura v Yan Sabanin | 6-4,6-1 |
| Challenger Toyota Qual | 2017/11/11 03:40 | Issei Okamura v Makoto Ochi | 6-7,6-7 |
| Challenger Kobe Qual | 2017/11/04 06:30 | Issei Okamura v Takuto Niki | 6-3,2-6,2-6 |
| ITF Thailand F9 | 2017/10/16 05:20 | Issei Okamura v Enrico Dalla Valle | 6-4,3-6,2-6 |