Stadium: Court 12 Round: 25
| ITF Malaysia F2 | 2018/07/10 03:50 | Purcell, Rhett v Oh, Seong-Gook | 7-6,7-5 |
| ITF Malaysia F1 | 2018/07/04 03:30 | Moritani, Soichiro v Oh, Seong-Gook | 6-4,6-0 |
| ITF Malaysia F1 | 2018/07/03 10:05 | Oh, Seong-Gook v Noh, Sang-Woo | 7-6,6-2 |
| ITF Korea F3 | 2018/06/18 03:30 | Oh, Seong-Gook v Hong, Seong Chan | 6-7,0-6 |
| ITF Korea F2 | 2018/06/13 03:05 | Oh, Seong-Gook v Wang, Chukang | 6-1,5-7,7-5 |
| ITF Korea F1 | 2018/06/05 01:00 | Oh, Seong-Gook v Choi, Jae-Won | 1-6,5-7 |
| Challenger Busan Qual | 2018/05/12 02:15 | Jeamoon Lee v Oh, Seong-Gook | 7-6,6-3 |
| Challenger Seoul Qual | 2018/04/28 02:50 | Ji Hoon Son v Oh, Seong-Gook | 6-3,6-3 |
| ITF Korea F3 | 2018/06/21 03:20 | Sanhui Shin v Kim, Cheong-Eui | 6-7,3-6 |
| ITF Korea F3 | 2018/06/19 08:30 | Yeongseok Jeong v Sanhui Shin | 6-4,5-7,2-6 |
| Korea F3, Singles Qualifying | 2018/06/18 03:30 | Seon Yong Han v Sanhui Shin | 1-6,6-2,4-6 |
| Korea F3, Singles Qualifying | 2018/06/17 04:30 | Sanhui Shin v Minjong Park | 6-0,6-7,6-4 |
| Korea F3, Singles Qualifying | 2018/06/16 03:30 | Sanhui Shin v Kim, Byeonghun | 6-2,6-0 |
| Challenger Seoul Qual | 2018/04/29 02:00 | Luke Saville v Sanhui Shin | 6-1,6-1 |
| Challenger Seoul Qual | 2018/04/28 01:30 | Sanhui Shin v Dong Ju Kim | 6-4,6-4 |
| ITF Thailand F4 | 2016/12/11 06:10 | Sanhui Shin v Levine, Andrei | 7-6,6-3 |