Stadium: Court 3 Round: 25 Ground: Clay
| 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 Kursumlijska Banja | 2024/05/07 10:10 | Branko Djuric v Daisuke Sumizawa | 6-3,7-5 |
| ITF M15 Kursumlijska Banja | 2024/05/02 09:50 | Daisuke Sumizawa v Peter Buldorini | 3-6,6-7 |
| ITF M15 Kursumlijska Banja | 2024/05/01 12:35 | Daisuke Sumizawa v Sergej Zivkovic | 6-4,6-4 |
| ITF M15 Kashiwa | 2024/04/04 01:30 | Daisuke Sumizawa v Keisuke Saitoh | 5-7,2-6 |
| 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 M25 Kursumlijska Banja | 2024/05/09 07:00 | Keisuke Saitoh v Peter Buldorini | 6-1,1-6,1-6 |
| ITF M25 Kursumlijska Banja | 2024/05/08 07:00 | Aleksandar Hudjec v Keisuke Saitoh | 0-6,2-6 |
| ITF M15 Kursumlijska Banja | 2024/05/01 10:35 | Keisuke Saitoh v Branko Djuric | 4-6,2-6 |
| ITF M15 Kursumlijska Banja | 2024/04/30 09:20 | Keisuke Saitoh v Yannik Kelm | 6-2,6-4 |
| ITF M15 Kashiwa | 2024/04/05 04:30 | Yu Hsiou Hsu v Keisuke Saitoh | 6-3,6-1 |
| ITF M15 Kashiwa | 2024/04/04 01:30 | Daisuke Sumizawa v Keisuke Saitoh | 5-7,2-6 |
| 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 |