Stadium: Center Court Round: 25 Ground: Hardcourt outdoor
| Challenger Busan | 2019/05/09 04:40 | Ricardas Berankis v Duckhee Lee | 6-3,3-6,6-3 |
| Challenger Busan | 2019/05/08 04:50 | Duckhee Lee v Yuichi Sugita | 5-7,6-3,7-6 |
| Challenger Busan | 2019/05/07 06:20 | Makoto Ochi v Duckhee Lee | 6-7,4-6 |
| Challenger Seoul | 2019/04/30 03:35 | Ji Sung Nam v Duckhee Lee | 7-5,6-1 |
| Challenger Nanchang | 2019/04/24 04:15 | Duckhee Lee v Goncalo Oliveira | 3-6,2-6 |
| Challenger Taipei | 2019/04/08 03:20 | Kaichi Uchida v Duckhee Lee | 6-4,6-4 |
| Challenger Shenzhen | 2019/03/15 09:00 | Brayden Schnur v Duckhee Lee | 6-4,4-6,7-5 |
| Challenger Shenzhen | 2019/03/14 10:55 | Zhe Li v Duckhee Lee | 3-6,3-6 |
| Challenger Gwangju | 2019/05/14 05:00 | Jeamoon Lee v Yunseong Chung | 6-7,2-6 |
| Challenger Busan | 2019/05/10 07:05 | Ricardas Berankis v Yunseong Chung | 5-7,6-3,6-4 |
| Challenger Busan | 2019/05/09 06:45 | Yunseong Chung v Marcos Baghdatis | 6-2,6-3 |
| Challenger Busan | 2019/05/07 04:05 | Nikola Milojevic v Yunseong Chung | 2-6,6-3,5-7 |
| Challenger Busan | 2019/05/06 04:10 | Yunseong Chung v Zhe Li | 3-6,6-3,6-4 |
| Challenger Seoul | 2019/05/02 04:00 | Yasutaka Uchiyama v Yunseong Chung | 6-4,6-4 |
| Challenger Seoul | 2019/05/01 05:20 | Yunseong Chung v Yuichi Sugita | 6-2,6-3 |
| Challenger Seoul | 2019/04/29 07:55 | Stephane Robert v Yunseong Chung | 6-1,2-6,4-6 |