Stadium: Court 1 Round: 28 Ground: Hardcourt outdoor
| 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 |
| ITF M15 Hinode | 2024/03/13 03:35 | Keisuke Saitoh v Sora Fukuda | 7-6,3-6,6-2 |
| ITF M15 Hinode | 2024/03/11 05:45 | Keisuke Saitoh v Yuta Kikuchi | 6-0,5-7,3-10 |
| ITF M15 Hinode | 2024/03/11 01:00 | Keisuke Saitoh v Ryoto Tachi | 6-3,6-2 |
| ITF M15 Tsukuba | 2024/03/28 03:20 | Ryotaro Taguchi v Sanhui Shin | 6-4,2-6,3-6 |
| ITF M15 Tsukuba | 2024/03/27 06:35 | Jangjun Kim v Ryotaro Taguchi | 2-6,0-6 |
| ITF M15 Tsukuba | 2024/03/25 06:00 | Ryotaro Taguchi v Koki Matsuda | 7-6,6-2 |
| ITF M15 Nishi-Tokyo | 2024/03/23 01:40 | Ryotaro Taguchi v Hikaru Shiraishi | 2-6,6-4,4-6 |
| ITF M15 Nishi-Tokyo | 2024/03/22 00:45 | Yan Bai v Ryotaro Taguchi | 3-6,5-7 |
| ITF M15 Nishi-Tokyo | 2024/03/21 01:00 | Ryotaro Taguchi v Jeamoon Lee | 6-3,5-7,6-3 |
| ITF M15 Nishi-Tokyo | 2024/03/20 00:50 | Ryotaro Taguchi v Tomohiro Masabayashi | 6-3,6-3 |
| ITF M15 Nishi-Tokyo | 2024/03/18 01:00 | Ryotaro Taguchi v Julien De Cuyper | 6-2,6-4 |