Seong Gook Oh defeated Sung Jun Park 6-4 6-7 7-5 in the M15 Daegu 1 round of 32 on hard. The upset overturned the form book — Sung Jun Park came in leading the head-to-head 1–0. Seong Gook Oh claimed a first win over Sung Jun Park in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2019-06-13 | M15 Gimcheon 1 | R16 | hard | Sung Jun Park | 1-6 7-5 6-4 |