Stadium: Court 1 Round: 25 Ground: Clay
| 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 Canberra | 2023/03/23 22:30 | Keisuke Saitoh v Jake Delaney | 6-4,0-6,6-4 |
| ITF M25 Canberra | 2023/03/21 00:35 | Keisuke Saitoh v Derek Pham | 6-1,7-6 |
| ITF M25 Kashiwa | 2023/04/03 04:00 | Ryotaro Taguchi v Asahi Harazaki | 6-4,7-6 |
| ITF M25 Tsukuba | 2023/03/27 04:00 | Koki Matsuda v Asahi Harazaki | 7-6,6-7,10-8 |
| ITF M25 Tsukuba | 2023/03/27 00:30 | Mao Takada v Asahi Harazaki | 2-6,5-7 |
| Challenger Yokkaichi | 2022/11/21 01:00 | Asahi Harazaki v Yuki Mochizuki | 3-6,4-6 |
| Challenger Yokkaichi | 2022/11/20 01:00 | Tsung-Hao Huang v Asahi Harazaki | 3-6,6-4,4-6 |
| Challenger Kobe | 2022/11/13 02:15 | Asahi Harazaki v Naoki Nakagawa | 3-6,2-6 |
| Challenger Yokohama | 2022/10/31 04:25 | Yuki Mochizuki v Asahi Harazaki | 6-3,6-4 |
| Challenger Yokohama | 2022/10/30 06:05 | Asahi Harazaki v Savriyan Danilov | 6-1,7-5 |