Ground: Hardcourt outdoor
| ITF M15 Osaka | 2025/04/24 04:00 | Hikaru Shiraishi v Jumpei Yamasaki | 7-6,6-7,0-3 |
| ITF M15 Osaka | 2025/04/22 03:45 | Hikaru Shiraishi v Kazuma Kawachi | 4-6,6-3,6-1 |
| ITF M15 Osaka | 2025/04/18 01:00 | Yusuke Kusuhara v Hikaru Shiraishi | 3-6,7-6,6-1 |
| ITF M15 Osaka | 2025/04/17 02:30 | Hoyoung Roh v Hikaru Shiraishi | 4-6,2-6 |
| ITF M15 Osaka | 2025/04/16 05:16 | Leo Vithoontien v Hikaru Shiraishi | 3-6,3-6 |
| ITF M15 Kashiwa | 2025/04/06 01:00 | Keisuke Saitoh v Hikaru Shiraishi | 6-7,6-4,7-6 |
| ITF M15 Kashiwa | 2025/04/05 03:05 | Taiyo Yamanaka v Hikaru Shiraishi | 4-6,2-6 |
| ITF M15 Kashiwa | 2025/04/04 05:40 | Yuto Oki v Hikaru Shiraishi | 2-6,2-6 |
| ITF M25 Santa Margherita | 2025/04/29 10:05 | Gian Marco Ortenzi v Naoki Tajima | 6-2,6-1 |
| ITF M25 Santa Margherita | 2025/04/28 08:00 | Naoki Tajima v Andrea Militi Ribaldi | 7-6,6-2 |
| ITF M25 Santa Margherita | 2025/04/18 08:30 | Gianmarco Ferrari v Naoki Tajima | 6-3,6-3 |
| ITF M25 Santa Margherita | 2025/04/14 07:00 | Naoki Tajima v Matteo Mura | 6-0,6-0 |
| ITF M25 Santa Margherita | 2025/04/07 08:00 | Matteo Mesaglio v Naoki Tajima | 7-5,6-1 |
| ITF M15 Tsukuba | 2025/03/25 04:00 | Naoki Tajima v Hyeon Chung | 3-6,2-6 |
| ITF M25 Shenzhen | 2025/03/18 02:00 | Keisuke Saitoh v Naoki Tajima | 6-4,6-1 |
| ITF M25 Shenzhen | 2025/03/17 02:00 | Naoki Tajima v Zhengyu Sun | 6-1,6-1 |