Stadium: Court 12 Round: 54 Ground: Hardcourt outdoor
| Challenger Busan | 2023/05/08 02:00 | Daisuke Sumizawa v Woobin Shin | 6-2,3-6,2-6 |
| Challenger Gwangju | 2023/04/30 04:10 | Daniel Masur v Daisuke Sumizawa | 6-0,6-4 |
| ITF M25 Kashiwa | 2023/04/06 01:30 | Daisuke Sumizawa v Yunseong Chung | 2-6,2-6 |
| ITF M25 Kashiwa | 2023/04/05 03:15 | Ryotaro Taguchi v Daisuke Sumizawa | 6-7,7-6,6-7 |
| ITF M25 Tsukuba | 2023/03/30 02:50 | Hiroki Moriya v Daisuke Sumizawa | 7-5,6-1 |
| ITF M25 Tsukuba | 2023/03/29 03:30 | Daisuke Sumizawa v Makoto Ochi | 1-6,7-5,6-4 |
| ITF M25 Canberra | 2023/03/21 02:50 | Jordan Smith v Daisuke Sumizawa | 6-4,7-6 |
| ITF M25 Canberra | 2023/03/14 00:20 | Dane Sweeny v Daisuke Sumizawa | 7-6,6-4 |
| Challenger Shenzhen Qual | 2018/03/11 09:40 | Jason Kubler v Pengyu Lu | 6-0,6-1 |
| Challenger Shenzhen Qual | 2018/03/11 05:00 | Cheng-Peng Hsieh v Pengyu Lu | 6-3,6-7,6-7 |