Sung Jun Park defeated Seong Gook Oh 1-6 7-5 6-4 in the M15 Gimcheon 1 round of 16 on hard. The upset overturned the form book — Seong Gook Oh came in leading the head-to-head 1–0. Sung Jun Park claimed a first win over Seong Gook Oh in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2019-06-05 | M15 Daegu 1 | R32 | hard | Seong Gook Oh | 6-4 6-7(4) 7-5 |