Estádio: Court 1 Round: 14 Ground: Hardcourt outdoor
| ITF - M15 Monastir | 2021/08/25 07:30 | Keisuke Saitoh v Jumpei Yamasaki | 1-6,1-6 |
| ITF M15 Kofu | 2019/03/19 01:00 | Keisuke Saitoh v Jumpei Yamasaki | 2-6,3-6 |
| ITF - M15 Heraklion | 2022/10/14 08:50 | Simone Roncalli v Jumpei Yamasaki | 6-4,6-3 |
| ITF - M15 Heraklion | 2022/10/13 08:40 | Thantub Suksumrarn v Jumpei Yamasaki | 6-7,2-6 |
| ITF - M15 Heraklion | 2022/10/12 11:40 | Gianluca Cadenasso v Jumpei Yamasaki | 6-7,3-6 |
| UTR Pro Tennis Series - Miki | 2022/07/09 00:30 | Asahi Harazaki v Jumpei Yamasaki | 7-5,5-2 |
| UTR Pro Tennis Series - Miki | 2022/07/08 00:30 | Yuichiro Inui v Jumpei Yamasaki | 3-6,6-3,4-6 |
| UTR Pro Tennis Series - Miki | 2022/07/07 04:58 | Kento Tagashira v Jumpei Yamasaki | 4-6,3-6 |
| UTR Pro Tennis Series - Miki | 2022/07/05 00:30 | Reiya Komagata v Jumpei Yamasaki | 0-6,3-6 |
| UTR Pro Tennis Series - Miki | 2022/07/04 02:00 | Jumpei Yamasaki v Ryotaro Matsumura | 6-4,6-2 |
| ITF - M25 Sapporo | 2022/09/10 00:50 | Rio Noguchi v Keisuke Saitoh | 1-6,6-3,6-0 |
| ITF - M25 Sapporo | 2022/09/09 01:00 | Ryota Tanuma v Keisuke Saitoh | 6-0,4-6,3-6 |
| ITF - M25 Sapporo | 2022/09/08 03:20 | Keisuke Saitoh v Shunsuke Nakagawa | 6-1,6-2 |
| ITF - M25 Sapporo | 2022/09/07 00:30 | Kazuki Nishiwaki v Keisuke Saitoh | 3-6,2-6 |
| 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 Cuala Lumpur | 2022/07/30 01:00 | Nam Hoang Ly v Keisuke Saitoh | 6-2,6-3 |