Stadium: Court 2 Round: 25
| 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 China F1 | 2018/01/11 02:30 | Oh, Seong-Gook v Shinji Hazawa | 3-6,4-6 |
| ITF China F1 | 2018/01/08 03:05 | Oh, Seong-Gook v Li, Yuanfeng | 7-6,6-2 |
| Challenger Toyota Qual | 2017/11/11 00:30 | Oh, Seong-Gook v Kibi, Yuya | 3-6,1-6 |
| ITF Malaysia F1 Qual | 2018/07/02 05:40 | Isaac Becroft v Noh, Sang-Woo | 1-6,3-6 |
| ITF Malaysia F1 Qual | 2018/07/01 09:30 | Eduardo Ribeiro v Noh, Sang-Woo | 1-6,4-6 |
| ITF Korea F3 | 2018/06/19 02:35 | Noh, Sang-Woo v Jae Hwan Kim | 4-6,0-6 |
| ITF Korea F2 | 2018/06/13 03:30 | Jae Hwan Kim v Noh, Sang-Woo | 6-2,6-3 |
| ITF Korea F2 | 2018/06/11 09:35 | Noh, Sang-Woo v Jung, Hyeon IL | 6-4,6-3 |
| ITF Korea F2 | 2018/06/10 05:00 | Noh, Sang-Woo v Lee, Seounghun | 6-3,6-3 |
| ITF Korea F1 | 2018/06/07 04:25 | Niki, Takuto v Noh, Sang-Woo | 6-3,6-2 |
| ITF Korea F1 | 2018/06/06 05:15 | Noh, Sang-Woo v Kim, Dukyoung | 6-4,6-1 |