| Challenger Yokohama | 2022/10/30 02:35 | Seiya Nakanishi v Daisuke Sumizawa | 3-6,0-6 |
| UTR Pro Kawaguchi | 2024/08/14 01:00 | Daisuke Sumizawa v Mao Takada | 6-1,6-4 |
| UTR Pro Kawaguchi | 2024/08/13 03:30 | Daisuke Sumizawa v Christopher Kosei Ono | 6-2,6-1 |
| UTR Pro Kawaguchi | 2024/08/12 00:00 | Emon Van Loben Sels v Daisuke Sumizawa | 7-6,6-4 |
| ITF M15 Nakhon Si Thammarat | 2024/07/17 02:30 | James Watt v Daisuke Sumizawa | 7-6,6-2 |
| ITF M15 Nakhon Si Thammarat | 2024/07/11 03:00 | Daisuke Sumizawa v Jesse Delaney | 3-6,6-3,6-7 |
| ITF M15 Nakhon Si Thammarat | 2024/07/10 02:00 | Daisuke Sumizawa v Kazuma Kawachi | 7-6,6-7,6-2 |
| ITF M15 Nakhon Si Thammarat | 2024/07/02 01:50 | Isaac Becroft v Daisuke Sumizawa | 6-1,6-4 |
| ITF M25 Changwon | 2024/06/18 02:25 | Jae Hwan Kim v Daisuke Sumizawa | 6-1,7-6 |
| 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 |
| UTR Pro Kawaguchi | 2024/08/12 03:30 | Seiya Nakanishi v Mao Takada | 6-4,6-2 |
| ITF M15 Tokyo | 2024/07/09 00:55 | Seiya Nakanishi v Yusaku Sugaya | 2-6,2-6 |
| ITF M15 Tokyo | 2024/07/08 03:30 | Naoki Tajima v Seiya Nakanishi | 3-6,6-3,6-10 |
| UTR Pro Kawaguchi | 2024/06/29 07:30 | Elijah Cham v Seiya Nakanishi | 1-6,6-4,6-4 |
| UTR Pro Kawaguchi | 2024/06/29 01:00 | Kosuke Nakanishi v Seiya Nakanishi | 6-4,1-6,4-6 |
| UTR Pro Kawaguchi | 2024/06/27 03:27 | Tomislav E Papac v Seiya Nakanishi | 3-6,1-6 |