Stadium: Center Court Round: 19 Ground: Hardcourt outdoor
| Challenger Gwangju | 2022/10/03 02:00 | Ji Sung Nam v Shinji Hazawa | 6-1,7-6 |
| Challenger Seoul | 2023/04/23 02:00 | Hiroki Moriya v Ji Sung Nam | 2-6,2-6 |
| Challenger Madrid | 2023/04/09 09:00 | Ji Sung Nam v Viktor Durasovic | 6-4,6-7,6-7 |
| Challenger Murcia | 2023/04/03 09:00 | Ji Sung Nam v Edas Butvilas | 6-2,3-6,1-6 |
| Challenger Murcia | 2023/04/02 09:00 | Daniel Rincon v Ji Sung Nam | 3-6,2-6 |
| Challenger Lille | 2023/03/26 11:00 | Ji Sung Nam v Beibit Zhukayev | 1-6,7-6,3-6 |
| Challenger Puerto Vallarta | 2023/03/05 19:10 | Guido Andreozzi v Ji Sung Nam | 6-3,6-1 |
| Challenger Chennai | 2023/02/13 04:30 | Ji Sung Nam v Sumit Nagal | 1-6,3-6 |
| Challenger Chennai | 2023/02/12 04:30 | Giovanni Mpetshi Perricard v Ji Sung Nam | 4-6,4-6 |
| Challenger Seoul | 2023/04/23 02:00 | Shinji Hazawa v Ajeet Rai | 4-6,6-3,6-4 |
| ITF M25 Kashiwa | 2023/04/05 01:00 | Hikaru Shiraishi v Shinji Hazawa | 6-7,6-2,6-3 |
| 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 |