Stadium: Centre Court Round: 54 Ground: Hardcourt outdoor
| ITF Hong Kong F3 | 2018/12/22 02:00 | Issei Okamura v Kyle Lok Yin Tang | 6-1,6-1 |
| Challenger Kobe | 2018/11/11 03:35 | Jacob Grills v Issei Okamura | 1-6,6-4,6-3 |
| Challenger Kobe | 2018/11/10 03:25 | Yuichi Ito v Issei Okamura | 4-6,7-6,3-6 |
| ITF Australia F8 | 2018/10/09 00:00 | Moerani Bouzige v Issei Okamura | 7-5,6-1 |
| ITF Australia F7 | 2018/10/04 03:55 | Benjamin Mitchell v Issei Okamura | 6-4,1-6,6-1 |
| ITF Australia F7 | 2018/10/02 00:00 | Issei Okamura v Vincent Stouff | 6-4,6-4 |
| ITF Australia F6 | 2018/09/25 00:30 | Connor Farren v Issei Okamura | 3-6,7-6,6-2 |
| ITF Australia F5 | 2018/09/21 01:00 | Brydan Klein v Issei Okamura | 6-3,6-2 |
| ITF Hong Kong F3 | 2018/12/22 02:00 | Coleman Wong v Taisei Ichikawa | 2-6,3-6 |
| Challenger Kobe | 2018/11/11 04:40 | Taisei Ichikawa v Colin Sinclair | 4-6,4-6 |
| Challenger Kobe | 2018/11/10 05:15 | Takuto Niki v Taisei Ichikawa | 6-2,6-7,3-6 |
| 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 |