Ground: Hardcourt outdoor
| ITF M15 Tsukuba | 2025/03/26 01:00 | Takuya Kumasaka v Issei Okamura | 7-5,6-1 |
| ITF M15 Nishi-Tokyo | 2025/03/19 04:00 | Ji Sung Nam v Issei Okamura | 6-1,6-1 |
| ITF M15 Hinode | 2025/03/13 02:00 | Issei Okamura v Hikaru Shiraishi | 2-6,2-6 |
| ITF M25 Launceston | 2025/02/24 23:00 | Issei Okamura v Ji Sung Nam | 6-7,3-6 |
| ITF M25 Launceston | 2025/02/24 01:01 | Issei Okamura v Adrian Arcon | 7-6,6-1 |
| ITF M25 Burnie | 2025/02/17 00:00 | Joshua Charlton v Issei Okamura | 6-1,6-3 |
| ITF M25 Timaru | 2025/02/12 21:00 | Yu Hsiou Hsu v Issei Okamura | 6-1,6-0 |
| ITF M25 Timaru | 2025/02/11 22:30 | Issei Okamura v Lev Gorb | 6-2,6-1 |
| ITF M25 Shenzhen | 2025/03/21 02:30 | Keisuke Saitoh v Oliver Crawford | 3-6,2-5 |
| ITF M25 Shenzhen | 2025/03/20 02:00 | Jie Cui v Keisuke Saitoh | 6-3,1-5 |
| ITF M25 Shenzhen | 2025/03/18 02:00 | Keisuke Saitoh v Naoki Tajima | 6-4,6-1 |
| ITF M25 Luan | 2025/03/12 02:37 | Kaichi Uchida v Keisuke Saitoh | 3-6,6-3,6-2 |
| ITF M25 Timaru | 2025/02/11 23:07 | Keisuke Saitoh v Kody Pearson | 3-6,1-6 |
| Challenger Brisbane | 2025/02/04 06:50 | Keisuke Saitoh v Andre Ilagan | 5-7,2-6 |
| Challenger Brisbane | 2025/02/03 00:00 | Keisuke Saitoh v Thomas Braithwaite | 6-4,6-4 |
| Challenger Brisbane Qual | 2025/02/02 01:55 | Keisuke Saitoh v Ty Host | 6-2,6-4 |