Stadium: Court 3 Round: 25 Ground: Hardcourt outdoor
| ITF M25 Changwon | 2023/06/14 06:00 | Keisuke Saitoh v Dominik Palan | 5-7,6-7 |
| ITF M25 Daegu | 2023/06/07 02:40 | Keisuke Saitoh v Dong Ju Kim | 1-6,2-6 |
| ITF M15 Karuizawa | 2023/06/01 00:30 | Keisuke Saitoh v Sanhui Shin | 4-6,1-6 |
| ITF M15 Karuizawa | 2023/05/30 08:10 | Keisuke Saitoh v Asahi Harazaki | 7-6,6-1 |
| Challenger Busan | 2023/05/08 02:00 | Keisuke Saitoh v Luke Saville | 3-6,1-6 |
| Challenger Gwangju | 2023/04/30 01:30 | Omar Jasika v Keisuke Saitoh | 6-0,6-0 |
| Challenger Seoul | 2023/04/23 06:00 | Omar Jasika v Keisuke Saitoh | 6-4,7-6 |
| ITF M25 Kashiwa | 2023/04/04 01:00 | Keisuke Saitoh v Yusuke Takahashi | 4-6,6-3,3-6 |
| ITF M25 Changwon | 2023/06/14 01:00 | Yunseong Chung v Yeongseok Jeong | 6-2,6-2 |
| ITF M25 Daegu | 2023/06/08 02:25 | Geun Jun Kim v Yeongseok Jeong | 6-1,2-6,6-4 |
| ITF M25 Daegu | 2023/06/06 01:05 | Yeongseok Jeong v Yunseok Jang | 7-5,4-6,6-1 |
| ITF M25 Jakarta | 2023/04/21 03:00 | Leo Borg v Yeongseok Jeong | 6-0,6-0 |
| ITF M25 Jakarta | 2023/04/20 03:50 | Yeongseok Jeong v Ray Ho | 6-4,6-4 |
| ITF M25 Jakarta | 2023/04/19 02:30 | Renta Tokuda v Yeongseok Jeong | 6-7,6-3,3-6 |
| ITF M25 Jakarta | 2023/04/18 02:00 | Yeongseok Jeong v Tegar A S Wibowo | 6-2,6-2 |
| ITF M25 Jakarta | 2023/04/17 04:30 | Yeongseok Jeong v Andrei Duarte | 6-4,6-4 |