Stadium: Court 7 Round: 14 Ground: Hardcourt outdoor
| ITF M25 Sapporo | 2022/09/09 01:00 | Ryota Tanuma v Keisuke Saitoh | 6-0,4-6,3-6 |
| ITF M15 Nonthaburi | 2019/11/27 02:30 | Keisuke Saitoh v Ryota Tanuma | 6-2,7-6 |
| Challenger Kobe | 2022/11/13 02:10 | Keisuke Saitoh v Jason Jung | 6-4,3-6,3-6 |
| Challenger Matsuyama | 2022/11/06 03:30 | Mukund Sasikumar v Keisuke Saitoh | 6-3,6-2 |
| Challenger Yokohama | 2022/10/31 01:30 | Seong Chan Hong v Keisuke Saitoh | 6-2,7-5 |
| 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 |
| Challenger Matsuyama | 2022/11/06 01:00 | Ryota Tanuma v Naoki Nakagawa | 3-6,4-6 |
| Challenger Yokohama | 2022/11/01 05:55 | Damir Dzumhur v Ryota Tanuma | 6-3,6-1 |
| Challenger Yokohama | 2022/10/31 01:30 | Rimpei Kawakami v Ryota Tanuma | 6-7,6-4,4-6 |
| Challenger Seoul | 2022/10/09 06:00 | Hamad Medjedovic v Ryota Tanuma | 6-4,6-3 |
| ATP Tokyo | 2022/10/01 07:55 | Ryota Tanuma v Ramkumar Ramanathan | 5-7,3-6 |
| ITF M25 Kashiwa | 2022/10/01 02:45 | Rimpei Kawakami v Ryota Tanuma | 6-3,6-2 |
| ITF M25 Kashiwa | 2022/09/30 01:00 | Ryota Tanuma v Koki Matsuda | 7-6,6-3 |
| ITF M25 Kashiwa | 2022/09/29 01:00 | Ryota Tanuma v Asahi Harazaki | 7-5,6-4 |