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 2–1. Sung Jun Park narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2019-06-05 | M15 Daegu 1 | R32 | hard | Seong Gook Oh | 6-4 6-7(4) 7-5 |
| 2015-08-17 | Korea F4 | Q64 | hard | Seong Gook Oh | 6-4 2-6 6-4 |
| 2013-06-17 | Korea F7 | Q16 | hard | Sung Jun Park | 6-2 6-3 |
Averages over each player's completed matches in the selected window (13 vs 17). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About