Stadium: Court 1 Round: 14 Ground: Hardcourt outdoor
| Challenger Gwangju | 2023/04/30 04:10 | Daniel Masur v Daisuke Sumizawa | 6-0,6-4 |
| ITF - Kashiwa M25 | 2023/04/06 01:30 | Daisuke Sumizawa v Yunseong Chung | 2-6,2-6 |
| ITF - Kashiwa M25 | 2023/04/05 03:15 | Ryotaro Taguchi v Daisuke Sumizawa | 6-7,7-6,6-7 |
| ITF - Tsukuba M25 | 2023/03/30 02:50 | Hiroki Moriya v Daisuke Sumizawa | 7-5,6-1 |
| ITF - Tsukuba M25 | 2023/03/29 03:30 | Daisuke Sumizawa v Makoto Ochi | 1-6,7-5,6-4 |
| ITF - Canberra M25 | 2023/03/21 02:50 | Jordan Smith v Daisuke Sumizawa | 6-4,7-6 |
| ITF - Canberra M25 | 2023/03/14 00:20 | Dane Sweeny v Daisuke Sumizawa | 7-6,6-4 |
| ITF - Burnie M25 | 2023/02/08 05:20 | Daisuke Sumizawa v Luke Saville | 3-6,4-6 |
| Challenger Gwangju | 2023/04/30 02:35 | Woobin Shin v Luke Saville | 2-6,0-6 |
| Challenger Seoul | 2023/04/23 02:00 | Woobin Shin v Mukund Sasikumar | 3-6,4-6 |
| ITF - Mysuru M25 | 2023/03/30 08:45 | George Loffhagen v Woobin Shin | 6-0,6-1 |
| ITF - Mysuru M25 | 2023/03/27 05:20 | Woobin Shin v Bharath Nishok Kumaran | 6-2,6-3 |
| ITF - Mysuru M25 | 2023/03/26 03:55 | Woobin Shin v Rashein Samuel | 6-0,6-4 |
| ITF - Lucknow M25 | 2023/03/22 08:00 | Boris Butulija v Woobin Shin | 2-6,6-4,6-4 |
| ITF - Lucknow M25 | 2023/03/21 06:05 | Woobin Shin v Pruchya Isarow | 6-4,6-3 |
| ITF - Lucknow M25 | 2023/03/20 10:00 | Woobin Shin v Theertha Shashank Macherla | 7-5,6-4 |