Stadium: Court 4 Round: 25 Ground: Hardcourt outdoor
| ITF Vietnam F5 | 2018/11/01 04:30 | Bergevi, Filip v Oh, Seong-Gook | 6-7,6-2,6-2 |
| ITF Vietnam F5 | 2018/10/31 03:00 | Oh, Seong-Gook v Grigoriy Lomakin | 6-3,2-6,6-4 |
| ITF Vietnam F4 | 2018/10/23 03:40 | Rio Noguchi v Oh, Seong-Gook | 6-3,6-2 |
| ITF Korea F6 | 2018/09/01 04:00 | Oh, Seong-Gook v Song, Min-Kyu | 1-6,6-7 |
| ITF Korea F6 | 2018/08/31 03:00 | Kim, Young Seok v Oh, Seong-Gook | 5-7,6-2,4-6 |
| ITF Korea F6 | 2018/08/30 03:00 | Kwon, OH-Hee v Oh, Seong-Gook | 4-6,1-6 |
| ITF Korea F6 | 2018/08/28 02:00 | Ma, William v Oh, Seong-Gook | 6-4,2-6,0-6 |
| ITF Korea F4 | 2018/08/19 03:15 | Jae Hwan Kim v Oh, Seong-Gook | 6-3,3-6,4-6 |
| ITF - M15 Daegu | 2019/06/04 02:55 | Lim, Hyung-Chan v Park, Sung Jun | 6-0,2-6,10-12 |
| ITF - M15 Daegu | 2019/06/03 01:00 | Park, Sung Jun v Lee, Seounghun | 6-2,6-0 |
| ITF Korea F6 | 2018/08/26 03:00 | Park, Sung Jun v Choi, Seungri | 6-1,5-7,2-6 |
| ITF Korea F6 | 2018/08/25 04:30 | Cho, Gwang Hyeon v Park, Sung Jun | 7-6,4-6,2-6 |
| ITF Korea F5 | 2018/08/20 01:00 | Park, Sung Jun v Ku Keon Kang | 3-6,1-6 |
| ITF Korea F5 | 2018/08/19 02:00 | Park, Sung Jun v Kim, Cheong Hwi | 6-0,6-2 |
| ITF Korea F5 | 2018/08/18 03:00 | Ji, Ang v Park, Sung Jun | 1-6,3-6 |
| Challenger Gwangju Qual | 2018/08/11 03:20 | Jang, Woo Hyeok v Park, Sung Jun | 6-4,6-3 |