Stadium: Centre Court Round: 54 Ground: Hardcourt outdoor
| Challenger Gwangju Qual | 2018/08/11 01:30 | Issei Okamura v Jung-Woong Na | 3-6,6-1,1-6 |
| Challenger Jinan | 2018/08/06 02:00 | Tak Khunn Wang v Issei Okamura | 6-1,6-2 |
| Challenger Jinan | 2018/08/05 02:00 | Chien Hsun Lo v Issei Okamura | 6-7,1-6 |
| Challenger Chengdu Qual | 2018/07/28 03:35 | Issei Okamura v Blake Ellis | 6-4,1-6,5-7 |
| ITF Chinese Taipei F2 | 2018/07/26 02:00 | Issei Okamura v Chun Hsin Tseng | 3-6,4-6 |
| ITF Chinese Taipei F2 | 2018/07/24 02:00 | Issei Okamura v Liang-Yu Lin | 6-2,6-2 |
| ITF Chinese Taipei F1 | 2018/07/19 04:05 | Yu Hsiou Hsu v Issei Okamura | 7-6,7-5 |
| ITF Chinese Taipei F1 | 2018/07/18 03:50 | Issei Okamura v Francesco Vilardo | 7-5,6-4 |
| ITF Japan F5 | 2018/04/06 01:00 | Zhe Li v Taisei Ichikawa | 6-2,7-6 |
| ITF Japan F5 | 2018/04/04 01:00 | Taisei Ichikawa v Renta Tokuda | 6-3,6-3 |
| ITF Japan F5 | 2018/04/03 01:00 | Shao-Fan Liu v Taisei Ichikawa | 6-7,0-6 |
| ITF Japan F8 | 2017/06/14 03:00 | Katsuki Nagao v Taisei Ichikawa | 6-0,6-1 |
| ITF Japan F8 | 2017/06/11 00:00 | Kazuma Kawachi v Taisei Ichikawa | 6-2,5-7,2-6 |
| ITF Japan F8 | 2017/06/10 00:00 | Kousuke Ogura v Taisei Ichikawa | 2-6,2-6 |