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