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 Carrara | 2024/11/26 00:00 | Daisuke Sumizawa v Ryan Fishback | 6-7,4-6 |
| ITF M25 Caloundra | 2024/11/21 01:00 | Kody Pearson v Daisuke Sumizawa | 5-7,6-1,6-2 |
| ITF M25 Caloundra | 2024/11/19 00:00 | Daisuke Sumizawa v Thomas Braithwaite | 6-3,6-1 |
| ITF M25 Caloundra | 2024/11/18 00:00 | Daisuke Sumizawa v Rohan Hazratwala | 6-4,6-2 |
| ITF M15 Tanagura | 2024/10/25 00:30 | Ryotaro Matsumura v Daisuke Sumizawa | 6-2,6-1 |
| ITF M15 Tanagura | 2024/10/24 05:05 | Seungmin Park v Daisuke Sumizawa | 6-7,1-6 |
| ITF M15 Tanagura | 2024/10/23 02:23 | Credit Chaiyarin v Daisuke Sumizawa | 6-7,4-6 |
| ITF M25 Takasaki | 2024/09/16 03:25 | Daisuke Sumizawa v Yamato Sueoka | 6-0,3-6,3-10 |
| UTR Pro Yokohama | 2024/12/01 00:00 | Tokitaka Ito v Seiya Nakanishi | 6-2,6-6 |
| UTR Pro Yokohama | 2024/11/30 03:00 | Kairi Inoue v Seiya Nakanishi | 3-6,6-7 |
| UTR Pro Yokohama | 2024/11/29 00:00 | Seiya Nakanishi v Kai Kawano | 6-7,3-6 |
| UTR Pro Yokohama | 2024/11/28 02:21 | Seiya Nakanishi v Koki Matsuda | 4-6,0-6 |
| UTR Pro Yokohama | 2024/11/27 09:00 | Henry Ren v Seiya Nakanishi | 6-1,7-6 |
| UTR Pro Yokohama | 2024/11/26 01:30 | Hakuto Imanishi v Seiya Nakanishi | 7-5,6-4 |
| ITF M15 Tanagura | 2024/10/23 00:30 | Yuta Kikuchi v Seiya Nakanishi | 6-1,6-4 |
| UTR Pro Urayasu | 2024/10/20 00:00 | Seiya Nakanishi v Ryusuke Horiuchi | 0-6,0-6 |