Estadio: Court 9 Round: 26 Ground: Hardcourt outdoor
| 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 M15 Kashiwa | 2024/04/02 05:00 | Daisuke Sumizawa v Koki Matsuda | 6-3,3-6,6-3 |
| ITF M15 Kashiwa | 2024/04/01 02:40 | Daisuke Sumizawa v Naoki Tajima | 4-6,6-1,10-8 |
| ITF M15 Kashiwa | 2024/03/31 01:00 | Daisuke Sumizawa v Tomohiro Masabayashi | 6-4,6-7,10-5 |
| ITF M15 Tsukuba | 2024/03/28 04:15 | Daisuke Sumizawa v Stefanos Sakellaridis | 3-6,6-3,1-6 |
| ITF M15 Tsukuba | 2024/03/27 04:15 | Ryotaro Shimomura v Daisuke Sumizawa | 6-4,3-6,4-6 |
| ITF M15 Tsukuba | 2024/03/25 06:00 | Daisuke Sumizawa v Masamichi Imamura | 6-3,6-4 |
| ITF M15 Tsukuba | 2024/03/24 01:00 | Daisuke Sumizawa v Linghao Zhang | 7-5,6-1 |
| ITF M15 Hinode | 2024/03/13 05:40 | Hikaru Shiraishi v Daisuke Sumizawa | 6-1,7-6 |
| ITF M15 Kashiwa | 2024/04/03 04:10 | Keisuke Saitoh v Tsung-Hao Huang | 6-2,6-3 |
| ITF M15 Kashiwa | 2024/04/01 01:00 | Jimmy Yang v Keisuke Saitoh | 1-6,3-6 |
| ITF M15 Kashiwa | 2024/03/31 01:00 | Yuttana Charoenphon v Keisuke Saitoh | 5-7,2-6 |
| ITF M15 Tsukuba | 2024/03/27 00:45 | Jeamoon Lee v Keisuke Saitoh | 4-6,6-1,6-4 |
| ITF M15 Tsukuba | 2024/03/25 06:00 | Jimmy Yang v Keisuke Saitoh | 3-6,4-6 |
| ITF M15 Tsukuba | 2024/03/24 01:00 | Yuttana Charoenphon v Keisuke Saitoh | 1-6,4-6 |
| ITF M15 Nishi-Tokyo | 2024/03/18 01:00 | Ko Suzuki v Keisuke Saitoh | 6-3,6-3 |
| ITF M15 Hinode | 2024/03/14 00:55 | Linang Xiao v Keisuke Saitoh | 6-4,6-2 |