Round: 44 Ground: Hardcourt outdoor
| ITF Korea F2 Qual | 2017/06/05 03:00 | Jun Sang Park v Dong-Hak Sin | 5-7,6-2,0-6 |
| ITF Korea F1 | 2018/06/03 02:00 | Dong-Hak Sin v Woo Hyeok Jang | 6-1,6-2 |
| Challenger Gwangju | 2017/09/19 01:30 | Dong-Hak Sin v Matthew Ebden | 5-7,3-6 |
| ITF Korea F5 | 2017/06/28 01:00 | Seong Chan Hong v Dong-Hak Sin | 7-5,6-3 |
| ITF Korea F5 | 2017/06/27 01:30 | Dong-Hak Sin v Woo-Ram Kim | 6-2,3-6,7-5 |
| ITF Korea F5 | 2017/06/26 01:30 | Dong-Hak Sin v Geon Ju Shin | 7-5,6-3 |
| ITF Korea F4 | 2017/06/20 01:00 | Dong-Hak Sin v Min Hyeok Cho | 4-6,0-6 |
| ITF Korea F4 | 2017/06/19 01:00 | Dong-Hak Sin v Byeonghun Kim | 6-3,6-1 |
| ITF Korea F4 | 2017/06/18 01:00 | Dong-Hak Sin v Jun Su Kim | 6-3,6-3 |
| ITF Korea F1 | 2018/06/03 02:00 | Jun Sang Park v Yu-Seob Kim | 5-7,6-3,6-2 |
| ITF Korea F1 | 2018/06/02 02:00 | Jun Sang Park v In Kyo Jeong | 6-1,6-2 |
| Challenger Gwangju | 2017/09/19 06:40 | Jun Sang Park v Alessandro Bega | 1-6,0-6 |
| ITF Korea F4 | 2017/06/20 01:00 | Jae Hwan Kim v Jun Sang Park | 6-4,6-0 |
| ITF Korea F4 | 2017/06/19 01:00 | Jun Sang Park v Danut Cuc | 6-1,6-1 |
| ITF Korea F4 | 2017/06/17 04:00 | Jun Sang Park v Jaeheon Yoon | 6-0,6-2 |
| ITF Korea F3 Qual | 2017/06/12 03:00 | Seong-Gook Oh v Jun Sang Park | 7-5,7-6 |
| ITF Korea F3 Qual | 2017/06/11 04:30 | Jun Sang Park v Woo Young Lee | 6-4,6-3 |