Stadium: Court 5 Round: 25 Ground: Hardcourt outdoor
| ITF - Nakhon Si Thammarat M15 | 2023/05/31 02:00 | Shinji Hazawa v Chase Ferguson | 2-6,4-6 |
| Challenger Busan | 2023/05/08 02:00 | Jason Jung v Shinji Hazawa | 6-2,6-4 |
| Challenger Gwangju | 2023/04/30 03:05 | Shinji Hazawa v Peter Gojowczyk | 1-6,3-6 |
| Challenger Seoul | 2023/04/24 02:00 | Ji Sung Nam v Shinji Hazawa | 6-2,6-4 |
| Challenger Seoul | 2023/04/23 02:00 | Shinji Hazawa v Ajeet Rai | 4-6,6-3,6-4 |
| ITF - Kashiwa M25 | 2023/04/05 01:00 | Hikaru Shiraishi v Shinji Hazawa | 6-7,6-2,6-3 |
| ITF - Tsukuba M25 | 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 |
| ITF - Nakhon Si Thammarat M15 | 2023/06/01 02:00 | Blake Ellis v Thantub Suksumrarn | 7-6,6-4 |
| ITF - Nakhon Si Thammarat M15 | 2023/05/31 02:00 | Thantub Suksumrarn v Jordan Chiu | 6-3,6-3 |
| ITF - Dżakarta M25 | 2023/04/18 03:35 | Yunseok Jang v Thantub Suksumrarn | 6-1,1-6,10-6 |
| ITF - Dżakarta M25 | 2023/04/17 05:30 | Bharath Nishok Kumaran v Thantub Suksumrarn | 2-6,1-6 |
| ITF - Singapur M15 | 2023/04/06 03:45 | Thantub Suksumrarn v Palaphoom Kovapitukted | 4-6,6-7 |
| ITF - Singapur M15 | 2023/04/05 08:10 | Thantub Suksumrarn v Jake Delaney | 7-5,6-4 |
| ITF - Singapur M15 | 2023/04/03 09:35 | Thantub Suksumrarn v Danielle Abadia | 6-1,6-4 |
| Challenger Nonthaburi | 2023/01/03 05:05 | Tung-Lin Wu v Thantub Suksumrarn | 6-4,6-1 |