Stadium: Covered Court 7 Round: 24 Ground: Hardcourt outdoor
| ITF China F7 | 2017/05/16 07:00 | Issei Okamura v Yusuke Takahashi | 7-5,2-6,4-6 |
| ITF Japan F8 | 2016/06/15 06:25 | Issei Okamura v Yusuke Takahashi | 3-6,0-6 |
| Challenger Granby | 2019/07/22 14:00 | Issei Okamura v Garanganga, Takanyi | 4-6,4-6 |
| Challenger Winnipeg | 2019/07/08 16:00 | Issei Okamura v Boulais, Justin | 2-6,5-7 |
| ITF - M15 Daegu | 2019/06/05 03:55 | Seita Watanabe v Issei Okamura | 6-4,7-6 |
| Luzhou, Simples M-ITF-CHN-07A | 2019/05/30 04:05 | Zheng, Weiqiang v Issei Okamura | 2-6,6-2,6-0 |
| Luzhou, Simples M-ITF-CHN-07A | 2019/05/29 02:00 | Chiu, Yu Hsiang v Issei Okamura | 4-6,1-6 |
| ITF - M25 Luan | 2019/05/16 05:05 | Yu Hsiou Hsu v Issei Okamura | 6-3,7-5 |
| ITF - M25 Luan | 2019/05/14 05:15 | Ehara, Hiroyasu v Issei Okamura | 4-6,2-6 |
| Wuhan, Qualifications Simples M-ITF-CHN-05A | 2019/05/07 04:00 | Issei Okamura v Tsung-Hao Huang | 3-6,6-1,8-10 |
| Taipei, Singles M-ITF-TPE-01A | 2019/07/26 02:00 | Yusuke Takahashi v Renta Tokuda | 1-6,5-7 |
| Taipei, Singles M-ITF-TPE-01A | 2019/07/25 04:30 | Yusuke Takahashi v Jumpei Yamasaki | 6-2,6-2 |
| Taipei, Singles M-ITF-TPE-01A | 2019/07/24 02:00 | Yusuke Takahashi v Lucas Renard | 5-7,7-6,6-2 |
| Taipei, Singles M-ITF-TPE-01A | 2019/07/18 10:10 | Yu, Cheng-Yu v Yusuke Takahashi | 7-5,6-2 |
| Taipei, Singles M-ITF-TPE-01A | 2019/07/16 06:25 | Tsai, Chang-Lin v Yusuke Takahashi | 6-7,1-6 |
| Yinchuan, Simples M-ITF-CHN-11A | 2019/06/25 03:40 | Zheng, Weiqiang v Yusuke Takahashi | 6-4,6-2 |
| Hong Kong, Simples M-ITF-HKG-04A | 2019/06/14 03:00 | Chun Hsin Tseng v Yusuke Takahashi | 4-6,7-5,6-1 |
| Hong Kong, Simples M-ITF-HKG-04A | 2019/06/13 05:50 | Michael Zhu v Yusuke Takahashi | 3-6,6-3,3-6 |