Stadium: Court 7 Round: 62 Ground: Hardcourt outdoor
| ITF - M25 Monastir | 2022/01/30 12:30 | Alberto Barroso Campos v Shinji Hazawa | 3-6,7-6,8-10 |
| ITF - M15 Antalya | 2020/02/15 07:00 | Maxime Hamou v Shinji Hazawa | 4-6,6-2,10-7 |
| ITF - M15 Antalya | 2020/02/06 07:30 | Michael Vrbensky v Shinji Hazawa | 6-0,6-4 |
| ITF - M15 Antalya | 2020/02/05 07:00 | Shinji Hazawa v Vladislav Ivanov | 5-7,7-5,6-1 |
| ITF - M15 Antalya | 2020/01/30 07:00 | Zsombor Piros v Shinji Hazawa | 6-3,6-3 |
| Challenger - Kobe | 2019/11/05 03:40 | Shinji Hazawa v Hiroki Moriya | 6-7,4-6 |
| Challenger - Kobe | 2019/11/04 06:30 | Ren Nakamura v Shinji Hazawa | 6-7,0-6 |
| Challenger - Yokkaichi | 2019/08/08 08:10 | Shinji Hazawa v Tatsuma Ito | 0-6,3-6 |
| ITF - M25 Monastir | 2022/01/30 12:30 | Keisuke Saitoh v Charlelie Cosnet | 1-6,6-1,10-6 |
| ITF - M25 Monastir | 2022/01/28 08:30 | Filip Misolic v Keisuke Saitoh | 6-1,6-4 |
| ITF - M25 Monastir | 2022/01/27 08:30 | Keisuke Saitoh v Harold Mayot | 6-4,6-4 |
| ITF - M25 Monastir | 2022/01/26 13:10 | Aziz Ouakaa v Keisuke Saitoh | 6-4,5-7,5-7 |
| ITF - M25 Monastir | 2022/01/24 13:55 | Florent Bax v Keisuke Saitoh | 2-6,3-6 |
| ITF - M25 Monastir | 2022/01/23 12:30 | Linghao Zhang v Keisuke Saitoh | 3-6,3-6 |
| ITF - M25 Monastir | 2022/01/20 08:00 | Keisuke Saitoh v Titouan Droguet | 3-6,0-6 |
| ITF - M25 Monastir | 2022/01/17 10:05 | Keisuke Saitoh v Alexandre Ruscica | 6-3,7-5 |