Estádio: Court 5 Round: 25 Ground: Hardcourt outdoor
| ITF - M25 Kashiwa | 2023/04/03 05:05 | Taisei Ichikawa v Hikaru Shiraishi | 4-6,2-6 |
| ITF - M25 Kashiwa | 2023/04/02 02:30 | Toru Horie v Hikaru Shiraishi | 6-3,5-7,4-10 |
| ITF - M25 Tsukuba | 2023/03/29 02:35 | Hikaru Shiraishi v Tristan Schoolkate | 4-6,0-6 |
| ITF - M25 Tsukuba | 2023/03/27 07:10 | Jeremy Jin v Hikaru Shiraishi | 4-6,1-6 |
| ITF - M25 Tsukuba | 2023/03/27 02:00 | Yusuke Kusuhara v Hikaru Shiraishi | 4-6,1-6 |
| ITF - M15 Monastir | 2023/03/10 08:30 | Florent Bax v Hikaru Shiraishi | 6-4,6-2 |
| ITF - M15 Monastir | 2023/03/09 08:30 | Hikaru Shiraishi v Stefanos Sakellaridis | 7-6,6-1 |
| ITF - M15 Monastir | 2023/03/08 13:00 | Ryuki Matsuda v Hikaru Shiraishi | 3-6,3-6 |
| ITF - M25 Tsukuba | 2023/03/28 05:55 | Ryuki Matsuda v Shinji Hazawa | 6-2,6-4 |
| Challenger - Puerto Vallarta | 2023/03/05 19:55 | Gabriel Decamps v Shinji Hazawa | 6-4,6-3 |
| Challenger - Rome GA | 2023/02/20 15:00 | Shinji Hazawa v Gabriele Thomas Brancatelli | 3-6,6-7 |
| Challenger - Rome GA | 2023/02/19 17:00 | Shinji Hazawa v Garrett Johns | 5-7,6-4,6-4 |
| ITF - M25 Burnie | 2023/02/10 00:50 | Alex Bolt v Shinji Hazawa | 2-6,7-6,6-2 |
| ITF - M25 Burnie | 2023/02/08 23:00 | Jake Delaney v Shinji Hazawa | 0-6,7-5,3-6 |
| ITF - M25 Burnie | 2023/02/07 00:25 | Shinji Hazawa v Makoto Ochi | 6-3,6-1 |
| Challenger - Burnie | 2023/01/31 23:00 | Thomas Fancutt v Shinji Hazawa | 4-6,6-3,6-3 |