Stadium: Court 8 Round: 26 Ground: Grass
| ITF Vietnam F2 MD | 2018/05/10 03:00 | Okamura I / Tanuma R v Wong H K / Yeung P L | 1-6,2-6 |
| ITF Vietnam F2 MD | 2018/05/08 07:30 | Romios M / Sinha N K v Okamura I / Tanuma R | 7-6,5-7,6-10 |
| ITF Japan F3 MD | 2017/03/22 06:05 | Okamura I / Tanuma R v Imai S / Uesugi K | 6-7,3-6 |
| ITF Thailand F2 MD | 2016/08/29 06:25 | Chung Y / Hong S-C v Okamura I / Tanuma R | 6-3,6-3 |
| Others | 2016/08/24 06:25 | Ratiwatana Sa / Ratiwatana So v Okamura I / Tanuma R | 7-5,6-3 |
| Others | 2016/08/22 10:15 | Kunsuwan N / Sincharoenwattana N v Okamura I / Tanuma R | 4-6,0-6 |
| ITF Japan F2 MD | 2015/03/16 05:00 | Okamura I / Tanuma R v Chaplin J / Mclachlan B | 2-6,1-6 |