Stadium: Court 4 Round: 25 Ground: Hardcourt outdoor
| ITF M15 Forbach | 2016/11/12 04:30 | Issei Okamura v Soichiro Moritani | 7-5,6-2 |
| ITF M15 Hua Hin | 2019/08/21 09:00 | Issei Okamura v Yu Hsiou Hsu | 2-6,1-6 |
| Challenger Yokkaichi | 2019/08/05 06:20 | Issei Okamura v Jie Cui | 3-6,3-6 |
| Challenger Chengdu | 2019/07/29 10:45 | Issei Okamura v Yusuke Takahashi | 1-6,2-6 |
| Challenger Granby | 2019/07/22 14:00 | Issei Okamura v Takanyi Garanganga | 4-6,4-6 |
| Challenger Winnipeg | 2019/07/08 16:00 | Issei Okamura v Justin Boulais | 2-6,5-7 |
| ITF M15 Tegu | 2019/06/05 03:55 | Seita Watanabe v Issei Okamura | 6-4,7-6 |
| ITF M25 Lu-čou | 2019/05/30 04:05 | Weiqiang Zheng v Issei Okamura | 2-6,6-2,6-0 |
| ITF M25 Lu-čou | 2019/05/29 02:00 | Yu Hsiang Chiu v Issei Okamura | 4-6,1-6 |
| ITF M15 Hua Hin | 2019/08/22 04:15 | Soichiro Moritani v Chukang Wang | 3-6,1-6 |
| ITF M15 Hua Hin | 2019/08/21 03:00 | Ko Suzuki v Soichiro Moritani | 4-6,4-6 |
| ITF M15 Jakarta | 2019/08/13 05:05 | Soichiro Moritani v Aaron Schmid | 3-6,3-6 |
| ITF M15 Jakarta | 2019/08/12 02:30 | Soichiro Moritani v Jesse Delaney | 6-3,6-0 |
| ITF M15 Jakarta | 2019/08/09 02:30 | Takashi Saito v Soichiro Moritani | 6-2,4-6,6-0 |
| ITF M15 Jakarta | 2019/08/08 03:50 | Soichiro Moritani v Niki Kaliyanda Poonacha | 7-6,7-6 |
| ITF M15 Jakarta | 2019/08/07 05:50 | Soichiro Moritani v Karunuday Singh | 7-5,6-2 |
| ITF M25 Nonthaburi | 2019/07/30 06:25 | Ryota Tanuma v Soichiro Moritani | 6-2,2-6,6-3 |