Stadium: Court 4 Round: 25 Ground: Hardcourt outdoor
| ITF M25 Sapporo | 2023/09/10 02:00 | Shuichi Sekiguchi v Daisuke Sumizawa | 6-1,6-4 |
| ITF M25 Sapporo | 2023/09/09 01:55 | Sora Fukuda v Daisuke Sumizawa | 4-6,4-6 |
| ITF M25 Sapporo | 2023/09/08 04:45 | Daisuke Sumizawa v Ko Suzuki | 7-5,6-2 |
| ITF M25 Sapporo | 2023/09/07 01:00 | Tomohiro Masabayashi v Daisuke Sumizawa | 3-6,3-6 |
| ITF M25 Hong Kong | 2023/08/30 04:10 | Egor Gerasimov v Daisuke Sumizawa | 4-6,6-3,7-5 |
| ITF M25 Hong Kong | 2023/08/28 02:00 | Daisuke Sumizawa v David Agung Susanto | 6-2,6-2 |
| ITF M25 Hong Kong | 2023/08/27 02:30 | Daisuke Sumizawa v Pengyu Lu | 3-6,6-1,10-5 |
| ITF M15 Caloundra | 2023/08/04 04:20 | Daisuke Sumizawa v Luke Saville | 4-6,4-6 |
| ITF M25 Sapporo | 2023/09/05 02:00 | Ryota Tanuma v Yunseok Jang | 6-4,7-5 |
| ITF M15 Nakhon Si Thammarat | 2023/08/29 03:40 | Yunseok Jang v Congsup Congcar | 2-6,0-6 |
| ITF M15 Nakhon Si Thammarat | 2023/08/23 06:30 | Yuttana Charoenphon v Yunseok Jang | 4-6,7-5,7-6 |
| ITF M25 Anseong | 2023/06/22 02:00 | Yunseok Jang v Yuki Mochizuki | 4-6,3-6 |
| ITF M25 Anseong | 2023/06/20 02:00 | Ji Hoon Son v Yunseok Jang | 6-4,3-6,0-6 |
| ITF M25 Changwon | 2023/06/14 02:20 | Yunseok Jang v Uisung Park | 2-6,5-7 |
| ITF M25 Daegu | 2023/06/06 01:05 | Yeongseok Jeong v Yunseok Jang | 7-5,4-6,6-1 |
| Challenger Seoul | 2023/04/23 02:00 | Edan Leshem v Yunseok Jang | 6-3,6-2 |