Jung Woong Na defeated Hong Chung 6-1 6-1 in the Korea F6 qualifying round on clay. The upset overturned the form book — Hong Chung came in leading the head-to-head 3–1. Jung Woong Na narrowed the head-to-head to 3–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2016-09-05 | Korea F8 | R16 | clay | Hong Chung | 2-6 6-4 6-1 |
| 2016-06-27 | Korea F3 | R16 | hard | Hong Chung | 6-7(4) 6-2 4-2 |
| 2015-05-25 | Korea F2 | R16 | hard | Jung Woong Na | 6-2 6-4 |
| 2013-05-06 | Korea F2 | R32 | hard | Hong Chung | 6-1 6-2 |
Averages over each player's completed matches in the selected window (14 vs 21). 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