Ground: Hardcourt outdoor
| ITF M15 Heraklion | 2025/10/03 07:00 | Ziga Sesko v Yuta Kawahashi | 6-0,6-1 |
| ITF M15 Heraklion | 2025/10/01 07:00 | Joao Graca v Yuta Kawahashi | 2-6,2-6 |
| ITF M25 Sapporo | 2025/09/10 01:00 | Kousuke Ogura v Yuta Kawahashi | 6-3,7-5 |
| ITF M15 Hong Kong | 2025/09/07 06:30 | Yuta Kawahashi v Arthur Weber | 2-6,3-6 |
| ITF M15 Hong Kong | 2025/09/06 02:00 | Yuta Kawahashi v Xing Dao Chen | 6-4,6-4 |
| ITF M15 Hong Kong | 2025/09/05 02:00 | Makoto Ochi v Yuta Kawahashi | 4-6,2-6 |
| ITF M15 Hong Kong | 2025/09/04 04:45 | Dmitry Bessonov v Yuta Kawahashi | 3-6,0-6 |
| ITF M15 Hong Kong | 2025/09/03 09:19 | Alexey Aleshchev v Yuta Kawahashi | 6-7,6-3,3-6 |
| ITF M25 Sapporo | 2025/09/02 01:00 | Issei Okamura v Seiya Nakanishi | 4-6,7-6,1-0 |
| ITF M15 Harmon | 2025/06/10 23:58 | Seiya Nakanishi v Kenta Miyoshi | 0-6,2-6 |
| UTR Pro Kawaguchi | 2025/04/27 05:05 | Seiya Nakanishi v Kenta Nakamura | 6-1,6-4 |
| UTR Pro Kawaguchi | 2025/04/27 01:00 | Seiya Nakanishi v Alexey Shtengelov | 6-7,6-4,7-5 |
| UTR Pro Kawaguchi | 2025/04/25 03:00 | Seiya Nakanishi v Masaki Tonaka | 6-7,6-3,7-5 |
| UTR Pro Kawaguchi | 2025/04/24 06:25 | Seiya Nakanishi v Ryota Tanuma | 3-6,4-6 |
| UTR Pro Kawaguchi | 2025/04/24 00:00 | Ko Nagashima v Seiya Nakanishi | 3-6,7-5,6-1 |
| UTR Pro Kawaguchi | 2025/04/22 02:10 | Hikaru Takahashi v Seiya Nakanishi | 4-6,7-5,6-1 |