Stadium: Court 1 Round: 25 Ground: Hardcourt outdoor
| ITF M15 Kofu | 2019/03/22 02:00 | Issei Okamura v Ryota Tanuma | 4-6,2-6 |
| ITF China F1 | 2018/01/11 02:30 | Ryota Tanuma v Issei Okamura | 6-1,6-2 |
| 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 |