Woong Sun Jun defeated Oh Hee Kwon 7-6 6-3 in the Korea Rep F1 qualifying round on hard. The upset overturned the form book — Oh Hee Kwon came in leading the head-to-head 2–1. Woong Sun Jun narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2010-04-12 | Korea F2 | R16 | hard | Woong Sun Jun | 3-6 6-4 6-1 |
| 2006-03-13 | Korea Rep F1 | SF | hard | Oh Hee Kwon | 6-4 6-2 |
| 2003-04-28 | Korea Rep F1 | QF | clay | Oh Hee Kwon | 6-3 6-2 |
Averages over each player's completed matches in the selected window (14 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