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 |
| Challenger Hua Hin Qual | 2017/11/19 04:00 | Hiroki Moriya v Ryota Tanuma | 6-4,6-3 |
| Challenger Hua Hin Qual | 2017/11/18 03:00 | Ryota Tanuma v Phongsapak Kerdlaphee | 6-4,6-4 |
| ITF Malaysia F3 | 2017/10/29 00:00 | Ryota Tanuma v Sam Matheson | 2-6,3-6 |
| ITF Malaysia F3 | 2017/10/28 03:00 | Ryota Tanuma v Liran Chen | 6-0,6-0 |
| ITF Malaysia F2 | 2017/10/24 01:00 | Ken Onishi v Ryota Tanuma | 6-4,3-6,6-1 |
| ITF Malaysia F1 | 2017/10/21 01:00 | Jurabek Karimov v Ryota Tanuma | 6-4,6-2 |
| ITF Malaysia F1 | 2017/10/20 01:00 | Ryota Tanuma v Takashi Saito | 7-6,3-6,7-6 |
| ITF Malaysia F1 | 2017/10/19 01:00 | Mikalai Haliak v Ryota Tanuma | 0-6,0-6 |
| 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 |
| ITF Thailand F8 Qual | 2017/10/09 03:25 | Riccardo Balzerani v Issei Okamura | 6-3,6-1 |
| ITF Thailand F8 Qual | 2017/10/08 07:20 | Remy Bertola v Issei Okamura | 6-3,3-6,6-7 |
| ITF Thailand F7 Qual | 2017/10/02 02:30 | Issei Okamura v Matteo Martineau | 6-4,6-7,2-6 |