Stadium: Court 1 Round: 27
| ITF Korea F6 | 2018/08/30 03:00 | Jae Hwan Kim v Young Seok Kim | 2-6,2-6 |
| ITF Korea F6 | 2018/08/29 03:00 | Young Seok Kim v Hong Chung | 6-4,5-7,7-5 |
| ITF Korea F3 | 2018/06/21 02:50 | Young Seok Kim v Jumpei Yamasaki | 6-7,4-6 |
| ITF Korea F3 | 2018/06/18 06:30 | Tae-Woo Lee v Young Seok Kim | 1-6,7-6,4-6 |
| ITF Korea F2 | 2018/06/13 06:50 | Young Seok Kim v Ji Sung Nam | 6-7,0-6 |
| ITF Korea F1 | 2018/06/06 02:50 | Young Seok Kim v Jae Hwan Kim | 4-6,4-6 |
| Challenger - Busan | 2018/05/15 02:00 | Young Seok Kim v Marcos Giron | 3-6,3-6 |
| Challenger Gimcheon Qual | 2018/05/06 04:30 | Renta Tokuda v Young Seok Kim | 6-3,6-2 |
| ITF Korea F6 | 2018/08/30 03:00 | Oh-Hee Kwon v Seong-Gook Oh | 4-6,1-6 |
| ITF Korea F6 | 2018/08/28 02:00 | William Ma v Seong-Gook Oh | 6-4,2-6,0-6 |
| ITF Korea F4 | 2018/08/19 03:15 | Jae Hwan Kim v Seong-Gook Oh | 6-3,3-6,4-6 |
| ITF Korea F4 | 2018/08/18 01:00 | Seong-Gook Oh v Uisung Park | 6-4,6-2 |
| ITF Korea F4 | 2018/08/17 01:00 | Seong-Gook Oh v Mousheg Hovhannisyan | 4-6,6-4,6-2 |
| ITF Korea F4 | 2018/08/16 01:00 | Seong-Gook Oh v Oh-Hee Kwon | 6-4,6-4 |
| 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 |