Round: 25 Ground: Hardcourt outdoor
| Challenger Busan Qual | 2017/05/13 02:00 | Young Seok Kim v Jeamoon Lee | 3-6,3-6 |
| Challenger Seoul | 2017/05/11 03:30 | Go Soeda v Young Seok Kim | 6-2,6-4 |
| Challenger Seoul | 2017/05/09 05:50 | Alexander Ward v Young Seok Kim | 3-6,4-6 |
| Challenger Gimcheon Qual | 2017/04/29 04:10 | Young Seok Kim v Hubert Hurkacz | 6-2,3-6,2-6 |
| ITF Thailand F6 | 2016/12/27 03:00 | Congsup Congcar v Young Seok Kim | 6-2,6-3 |
| ITF Thailand F5 | 2016/12/21 04:20 | Min Hyeok Cho v Young Seok Kim | 6-2,6-2 |
| ITF Thailand F5 | 2016/12/19 03:00 | Young Seok Kim v Yunseong Chung | 3-6,6-4,7-6 |
| Others | 2016/11/12 05:50 | Hiroka Kondo v Young Seok Kim | 6-4,6-4 |
| Challenger Busan | 2017/05/18 08:35 | Tatsuma Ito v Hong Chung | 6-2,1-6,6-1 |
| Challenger Busan | 2017/05/16 05:25 | Yuya Kibi v Hong Chung | 1-6,6-4,4-6 |
| Challenger Seoul | 2017/05/08 07:00 | Hong Chung v Dudi Sela | 5-7,3-6 |
| Challenger Gimcheon Qual | 2017/04/30 01:00 | Hong Chung v Liam Broady | 5-7,3-6 |
| Challenger Gimcheon Qual | 2017/04/29 02:20 | Sidharth Rawat v Hong Chung | 6-7,3-6 |
| ITF Japan F3 | 2017/03/22 07:00 | Hong Chung v Takuto Niki | 3-6,5-7 |
| ITF Japan F3 | 2017/03/22 02:05 | Hong Chung v Rimpei Kawakami | 6-2,3-6,6-2 |
| ITF Japan F2 | 2017/03/15 02:00 | Zhe Li v Hong Chung | 6-1,6-7,6-3 |