Stadium: 9 Round: 25 Ground: Hardcourt outdoor
| ITF M15 Kursumlijska Banja | 2024/05/14 09:55 | Daisuke Sumizawa v Keisuke Saitoh | 4-6,7-5,3-6 |
| ITF M15 Kashiwa | 2024/04/04 01:30 | Daisuke Sumizawa v Keisuke Saitoh | 5-7,2-6 |
| ITF M25 Sapporo | 2022/08/30 02:55 | Keisuke Saitoh v Daisuke Sumizawa | 5-7,6-3,4-6 |
| ITF M15 Sharm El Sheikh | 2021/02/16 09:25 | Daisuke Sumizawa v Keisuke Saitoh | 2-6,4-6 |
| ITF M25 Sapporo | 2024/09/06 01:00 | Kokoro Isomura v Keisuke Saitoh | 6-2,6-4 |
| ITF M25 Sapporo | 2024/09/05 03:10 | Hiromasa Koyama v Keisuke Saitoh | 0-6,6-4,3-6 |
| ITF M25 Sapporo | 2024/09/04 01:00 | Keisuke Saitoh v Masamichi Imamura | 7-5,6-2 |
| ITF M25 Taipei | 2024/08/07 07:55 | Tsung-Hao Huang v Keisuke Saitoh | 6-3,6-2 |
| ITF M25 Taipei | 2024/08/04 02:00 | Yu Hsiou Hsu v Keisuke Saitoh | 3-6,1-6 |
| ITF M25 Taipei | 2024/08/03 01:55 | Keisuke Saitoh v Ryotaro Taguchi | 3-6,7-6,7-6 |
| ITF M25 Taipei | 2024/08/02 02:00 | Keisuke Saitoh v Takuya Kumasaka | 6-1,6-4 |
| ITF M25 Taipei | 2024/08/01 04:20 | Kokoro Isomura v Keisuke Saitoh | 3-6,4-6 |
| 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 |
| UTR Pro Kawaguchi | 2024/08/17 00:00 | Ryotaro Taguchi v Daisuke Sumizawa | 6-2,7-5 |