Stadium: Court 6 Round: 25 Ground: Hardcourt outdoor
| ITF - M15 Daegu | 2022/09/01 03:50 | Kazuki Nishiwaki v Cheong-Eui Kim | 0-6,0-6 |
| ITF - M15 Daegu | 2022/08/31 05:40 | Kazuki Nishiwaki v Suk Ann | 6-3,6-1 |
| ITF - M15 Changwon | 2022/08/26 01:00 | Kazuki Nishiwaki v Jeamoon Lee | 3-6,3-6 |
| ITF - M15 Changwon | 2022/08/25 03:00 | Ku Keon Kang v Kazuki Nishiwaki | 3-6,1-6 |
| ITF - M15 Changwon | 2022/08/23 00:50 | Ko Suzuki v Kazuki Nishiwaki | 4-6,3-6 |
| ITF - M15 Jakarta | 2022/08/18 02:00 | S D Prajwal Dev v Kazuki Nishiwaki | 6-3,6-4 |
| ITF - M15 Jakarta | 2022/08/16 05:50 | Kazuki Nishiwaki v Masamichi Imamura | 6-3,3-6,6-1 |
| ITF - M15 Jakarta | 2022/08/09 05:05 | Uisung Park v Kazuki Nishiwaki | 4-6,6-2,6-3 |
| ITF - M25 Sapporo | 2022/08/30 02:55 | Keisuke Saitoh v Daisuke Sumizawa | 5-7,6-3,4-6 |
| ITF - M15 Kuching | 2022/08/04 04:30 | Tsung-Hao Huang v Keisuke Saitoh | 6-1,6-0 |
| ITF - M15 Kuching | 2022/08/02 01:00 | Keisuke Saitoh v Vishnu Vardhan | 6-1,7-5 |
| ITF - M15 Kuala Lumpur | 2022/07/30 01:00 | Nam Hoang Ly v Keisuke Saitoh | 6-2,6-3 |
| ITF - M15 Kuala Lumpur | 2022/07/29 01:00 | Uisung Park v Keisuke Saitoh | 3-6,3-6 |
| ITF - M15 Kuala Lumpur | 2022/07/26 02:15 | Hao Sheng Koay v Keisuke Saitoh | 3-6,1-6 |
| ITF - M15 Monastir | 2022/07/07 11:05 | Keisuke Saitoh v Guy Orly Iradukunda | 1-6,0-6 |
| ITF - M15 Monastir | 2022/07/06 09:35 | Keisuke Saitoh v Egor Tsarapkin | 6-2,6-2 |