Stadion: Court 5 Round: 25 Ground: Hardcourt outdoor
| 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 - Tsukuba | 2023/03/28 07:55 | Tatsuma Ito v Keisuke Saitoh | 4-6,7-5,6-2 |
| ITF - M25 - Canberra | 2023/03/24 03:30 | Keisuke Saitoh v Tristan Schoolkate | 2-6,4-6 |
| ITF - M25 - Daegu | 2023/06/05 06:40 | Dong Ju Kim v Woodam Song | 6-1,6-2 |
| ITF - M25 - Daegu | 2023/06/05 02:50 | Dong Ju Kim v Byeonghun Kim | 6-2,6-2 |
| ITF - M25 - Daegu | 2023/06/04 01:00 | Dong Ju Kim v Young Seok Lee | 6-2,3-6,10-7 |
| ITF - M15 - Daegu | 2022/09/01 02:00 | Kazuma Kawachi v Dong Ju Kim | 6-7,6-0,6-4 |
| ITF - M15 - Daegu | 2022/08/31 08:40 | Dae Han Kim v Dong Ju Kim | 0-6,4-6 |
| ITF - M15 - Anseong | 2022/08/17 01:00 | Sanhui Shin v Dong Ju Kim | 7-6,6-1 |
| ITF - M15 - Sharm El Sheikh | 2022/03/27 09:00 | Petar Teodorovic v Dong Ju Kim | 7-5,2-6,10-6 |
| ITF - M15 - Sharm El Sheikh | 2022/03/17 10:50 | Dong Ju Kim v Sergey Fomin | 1-6,2-6 |