Stadium: Court 2 Round: 26
| ITF Korea F4 | 2018/08/16 01:00 | Oh, Seong-Gook v Kwon, OH-Hee | 6-4,6-4 |
| ITF Korea F6 | 2018/08/28 02:00 | Kwon, OH-Hee v Daisuke Sumizawa | 6-1,6-4 |
| ITF Korea F5 | 2018/08/22 02:00 | Kwon, OH-Hee v Chung, Hong | 3-6,1-6 |
| ITF Korea F5 | 2018/08/21 03:00 | Jumpei Yamasaki v Kwon, OH-Hee | 4-6,4-6 |
| ITF Korea F4 | 2018/08/16 01:00 | Oh, Seong-Gook v Kwon, OH-Hee | 6-4,6-4 |
| ITF Korea F4 | 2018/08/14 02:30 | Kwon, OH-Hee v Im, Seong Taek | 6-3,6-4 |
| ITF Korea F3 | 2018/06/22 03:00 | Yunseong Chung v Kwon, OH-Hee | 6-4,6-1 |
| ITF Korea F3 | 2018/06/20 02:30 | Kwon, OH-Hee v Hong, Seong Chan | 7-5,6-4 |
| ITF Korea F3 | 2018/06/19 06:35 | Cing-Yang Meng v Kwon, OH-Hee | 1-6,2-6 |
| 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 Korea F4 | 2018/08/18 01:00 | Oh, Seong-Gook v Park, Uisung | 6-4,6-2 |
| ITF Korea F4 | 2018/08/17 01:00 | Oh, Seong-Gook v Hovhannisyan, Mousheg | 4-6,6-4,6-2 |
| ITF Korea F4 | 2018/08/16 01:00 | Oh, Seong-Gook v Kwon, OH-Hee | 6-4,6-4 |
| 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 |