Stadium: Green Tennis Plaza - Court 08 Ground: Hardcourt outdoor
Referee:
| UTR Pro Noda | 2023/10/16 00:30 | Shingo Masuda v Masaya Yufu | 1-6,1-6 |
| UTR Pro Kawaguchi | 2025/05/04 03:15 | Ryota Tanuma v Yoshinori Kobayashi | 6-0,6-0 |
| UTR Pro Kawaguchi | 2025/05/03 03:50 | Yuga Tashiro v Yoshinori Kobayashi | 1-6,1-6 |
| UTR Pro Kawaguchi | 2025/05/01 04:20 | Ko Nagashima v Yoshinori Kobayashi | 4-6,0-6 |
| UTR Pro Kawaguchi | 2025/05/01 00:00 | Kotaro Mochizuki v Yoshinori Kobayashi | 3-6,4-6 |
| UTR Pro Kawaguchi | 2025/04/30 02:05 | Koyu Yanagi v Yoshinori Kobayashi | 6-2,1-6,0-6 |
| UTR Pro Kawaguchi | 2025/04/28 03:25 | Kenta Nakamura v Yoshinori Kobayashi | 2-6,3-6 |
| ITF M15 Nishi-Tokyo | 2025/03/18 01:00 | Yoshinori Kobayashi v Toshiki Karigyo | 4-6,6-4,0-1 |
| UTR Pro Yokohama | 2025/02/09 01:00 | Ryotaro Matsumura v Yoshinori Kobayashi | 6-0,6-4 |