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 |
| UTR Pro Yokohama | 2025/02/04 03:25 | Daisuke Sumizawa v Christopher Kosei Ono | 6-3,4-6,6-7 |
| UTR Pro Yokohama | 2025/02/03 04:15 | Arjun Mehrotra v Daisuke Sumizawa | 5-7,6-4,7-6 |
| UTR Pro Noda | 2025/01/19 04:00 | Ryotaro Matsumura v Daisuke Sumizawa | 6-4,3-6,6-3 |
| UTR Pro Noda | 2025/01/17 00:30 | Daisuke Sumizawa v Hiroyasu Ehara | 6-1,6-0 |
| UTR Pro Noda | 2025/01/15 01:35 | Daisuke Sumizawa v Ryoto Tachi | 6-4,6-1 |
| UTR Pro Noda | 2025/01/13 00:30 | Koyu Yanagi v Daisuke Sumizawa | 3-6,3-6 |
| ITF M25 Bali | 2025/01/02 05:00 | Daisuke Sumizawa v Chase Ferguson | 3-6,2-6 |
| ITF M25 Bali | 2025/01/01 03:00 | Daisuke Sumizawa v Yusuke Kusuhara | 6-3,6-0 |
| UTR Pro Yokohama | 2025/02/07 01:00 | Kairi Inoue v Seiya Nakanishi | 6-3,6-3 |
| UTR Pro Yokohama | 2025/02/06 01:00 | Koki Matsuda v Seiya Nakanishi | 6-4,2-6,6-2 |
| UTR Pro Yokohama | 2025/02/05 01:00 | Yuta Tomida v Seiya Nakanishi | 3-6,6-3,7-5 |
| UTR Pro Yokohama | 2025/02/03 01:00 | Kazuki Sugimoto v Seiya Nakanishi | 6-4,1-6,6-4 |
| UTR Pro Noda | 2025/01/19 04:10 | Seiya Nakanishi v Abhishek Bastola | 6-4,6-4 |
| UTR Pro Noda | 2025/01/18 02:15 | Seiya Nakanishi v Mao Takada | 6-0,6-2 |
| UTR Pro Noda | 2025/01/17 00:30 | Andras Necz v Seiya Nakanishi | 6-7,6-3,4-6 |
| UTR Pro Noda | 2025/01/16 01:45 | Koki Matsuda v Seiya Nakanishi | 7-5,3-6,7-5 |