Stadium: KPI Park - Court 03 Ground: Hardcourt outdoor
Referee:
| ITF M15 Karuizawa | 2025/06/04 05:58 | Ryotaro Matsumura v Ko Nagashima | 6-1,6-2 |
| UTR Pro Urayasu | 2025/05/24 02:15 | Mattias Southcombe v Ko Nagashima | 6-1,7-6 |
| UTR Pro Urayasu | 2025/05/23 01:40 | Taichi Wakamatsu v Ko Nagashima | 6-1,7-5 |
| UTR Pro Urayasu | 2025/05/22 01:00 | Taiyo Kurata v Ko Nagashima | 6-2,2-6,6-1 |
| UTR Pro Urayasu | 2025/05/21 02:45 | Derek Pham v Ko Nagashima | 6-1,6-4 |
| UTR Pro Urayasu | 2025/05/19 06:05 | Stefan Harangozo v Ko Nagashima | 6-3,4-6,5-7 |
| UTR Pro Kawaguchi | 2025/05/04 01:00 | Masaya Kobayashi v Ko Nagashima | 6-4,1-6,3-6 |
| UTR Pro Kawaguchi | 2025/05/03 00:00 | Yusuke Yoshikawa v Ko Nagashima | 4-6,7-6,3-6 |
| UTR Pro Fukui | 2025/06/21 00:00 | Christopher Kosei Ono v Haru Kawanaka | 4-6,6-3,6-2 |
| UTR Pro Fukui | 2025/06/20 05:10 | Haru Kawanaka v Aryan Jit Singh | 6-2,6-1 |
| UTR Pro Fukui | 2025/06/19 01:50 | Haru Kawanaka v Kotaro Mochizuki | 1-6,0-6 |
| UTR Pro Fukui | 2025/06/18 05:15 | Nuutti Jokinen v Haru Kawanaka | 0-6,6-2,3-6 |
| UTR Pro Fukui | 2025/06/17 04:05 | Taiyo Kurata v Haru Kawanaka | 6-3,6-3 |
| UTR Pro Urayasu | 2025/05/23 05:20 | Mattias Southcombe v Haru Kawanaka | 6-2,3-6,6-3 |
| UTR Pro Urayasu | 2025/05/23 03:35 | Ryota Tanuma v Haru Kawanaka | 6-0,6-3 |
| UTR Pro Urayasu | 2025/05/22 04:55 | Jaden Dewandaka Tan v Haru Kawanaka | 6-3,6-2 |