Ground: Hardcourt outdoor
| UTR Pro Kawaguchi | 2025/05/04 03:15 | Ryota Tanuma v Yoshinori Kobayashi | 6-0,6-0 |
| UTR Pro Kawaguchi | 2025/05/03 02:35 | Ryota Tanuma v Felix Mischker | 6-2,6-1 |
| UTR Pro Kawaguchi | 2025/05/01 03:20 | Maximus Z Wong v Ryota Tanuma | 0-6,2-6 |
| UTR Pro Kawaguchi | 2025/05/01 00:00 | Christopher Kosei Ono v Ryota Tanuma | 1-6,1-6 |
| UTR Pro Kawaguchi | 2025/04/28 01:00 | Ryota Tanuma v Yuta Dokai | 6-4,6-2 |
| UTR Pro Kawaguchi | 2025/04/27 02:10 | Ryota Tanuma v Yuga Tashiro | 6-4,6-2 |
| UTR Pro Kawaguchi | 2025/04/26 02:40 | Ryota Tanuma v Felix Mischker | 6-2,6-0 |
| UTR Pro Kawaguchi | 2025/04/25 01:00 | Hikaru Takahashi v Ryota Tanuma | 1-6,3-6 |
| ITF M15 Osaka | 2025/04/16 09:29 | Kokoro Isomura v Kentaro Otsuka | 6-2,6-1 |
| ITF M15 Osaka | 2025/04/15 02:30 | Kentaro Otsuka v Kohei Hayashi | 6-3,6-5 |
| ITF M15 Hinode | 2025/03/12 01:00 | Kentaro Otsuka v Takuya Kumasaka | 1-6,1-6 |
| Challenger Matsuyama | 2024/11/03 03:35 | Benoit Paire v Kentaro Otsuka | 6-1,6-0 |
| ITF M15 Yanagawa | 2024/10/28 01:30 | Taki Adachi v Kentaro Otsuka | 6-4,4-6,5-10 |
| ITF M15 Hinode | 2024/03/11 01:00 | Kentaro Otsuka v Shohei Chikami | 4-6,7-5,12-10 |
| ITF M15 Hinode | 2024/03/10 01:00 | Maximus Kawabata v Kentaro Otsuka | 1-6,0-6 |