Stadium: Court 2 Round: 28
| ITF Malaysia F2 | 2018/07/10 03:50 | Rhett Purcell v Seong-Gook Oh | 7-6,7-5 |
| ITF Malaysia F1 | 2018/07/04 03:30 | Soichiro Moritani v Seong-Gook Oh | 6-4,6-0 |
| ITF Malaysia F1 | 2018/07/03 10:05 | Seong-Gook Oh v Sang-Woo Noh | 7-6,6-2 |
| ITF Korea F3 | 2018/06/18 03:30 | Seong-Gook Oh v Seong Chan Hong | 6-7,0-6 |
| ITF Korea F2 | 2018/06/13 03:05 | Seong-Gook Oh v Chukang Wang | 6-1,5-7,7-5 |
| ITF Korea F1 | 2018/06/05 01:00 | Seong-Gook Oh v Jae-Won Choi | 1-6,5-7 |
| Challenger Busan Qual | 2018/05/12 02:15 | Jeamoon Lee v Seong-Gook Oh | 7-6,6-3 |
| Challenger Seoul Qual | 2018/04/28 02:50 | Ji Hoon Son v Seong-Gook Oh | 6-3,6-3 |
| ITF China F10 | 2018/07/10 03:30 | Min-Kyu Song v Runhao Hua | 4-6,2-6 |
| ITF China F9 | 2018/07/07 07:30 | Yan Bai v Min-Kyu Song | 7-6,6-3 |
| ITF China F9 | 2018/07/06 03:00 | Min-Kyu Song v Shuichi Sekiguchi | 6-2,6-1 |
| ITF China F9 | 2018/07/05 03:00 | Min-Kyu Song v Jie Cui | 7-5,6-0 |
| ITF China F9 | 2018/07/03 09:10 | Yuya Kibi v Min-Kyu Song | 5-7,2-6 |
| ITF Korea F3 | 2018/06/20 02:30 | Yunseong Chung v Min-Kyu Song | 7-6,7-6 |
| ITF Korea F3 | 2018/06/18 01:00 | Min-Kyu Song v Michael Zhu | 6-4,6-2 |
| ITF Korea F2 | 2018/06/13 04:55 | Takuto Niki v Min-Kyu Song | 3-6,7-5,6-3 |