Stadium: KPI Park - Court 02 Round: 28 Ground: Hardcourt outdoor
Referee:
| UTR Pro Kawaguchi | 2024/08/15 07:43 | Daisuke Sumizawa v Seiya Nakanishi | 6-2,6-3 |
| Challenger Yokohama | 2022/10/30 02:35 | Seiya Nakanishi v Daisuke Sumizawa | 3-6,0-6 |
| ITF M25 Sapporo | 2024/09/10 01:00 | Keisuke Saitoh v Daisuke Sumizawa | 6-1,6-2 |
| ITF M25 Sapporo | 2024/09/07 02:30 | Naoki Nakagawa v Daisuke Sumizawa | 6-3,6-4 |
| ITF M25 Sapporo | 2024/09/06 03:00 | Jacob Brumm v Daisuke Sumizawa | 6-2,4-6,4-6 |
| ITF M25 Sapporo | 2024/09/05 01:00 | Riku Takahata v Daisuke Sumizawa | 2-6,3-6 |
| ITF M25 Sapporo | 2024/09/04 01:00 | Daisuke Sumizawa v Bor Artnak | 6-4,6-4 |
| ITF M25 Sapporo | 2024/09/02 01:00 | Daisuke Sumizawa v Ke Hau Hung | 6-0,6-2 |
| ITF M25 Hong Kong | 2024/08/29 04:45 | Arthur Weber v Daisuke Sumizawa | 6-2,7-6 |
| ITF M25 Hong Kong | 2024/08/27 06:40 | Daisuke Sumizawa v Ki Lung NG | 6-3,6-2 |
| ITF M25 Sapporo | 2024/09/09 03:30 | Shunsuke Nakagawa v Seiya Nakanishi | 6-2,6-2 |
| ITF M25 Sapporo | 2024/09/08 01:00 | Yusuke Yoshikawa v Seiya Nakanishi | 7-6,6-7,7-10 |
| ITF M25 Sapporo | 2024/09/02 02:35 | Brandon Perez v Seiya Nakanishi | 7-5,6-1 |
| UTR Pro Kawaguchi | 2024/08/18 00:00 | Seiya Nakanishi v Kazuki Sugimoto | 3-6,2-6 |
| UTR Pro Kawaguchi | 2024/08/17 00:00 | Sora Fukuda v Seiya Nakanishi | 3-6,0-6 |
| UTR Pro Kawaguchi | 2024/08/15 07:43 | Daisuke Sumizawa v Seiya Nakanishi | 6-2,6-3 |
| UTR Pro Kawaguchi | 2024/08/15 01:00 | Christopher Kosei Ono v Seiya Nakanishi | 6-7,5-7 |
| UTR Pro Kawaguchi | 2024/08/13 03:30 | Emon Van Loben Sels v Seiya Nakanishi | 6-3,6-1 |