Jung Woong Na defeated Daniel Yoo 2-6 6-1 6-3 in the Busan CH qualifying round 1 on hard. The result followed the form book — Jung Woong Na came in leading the head-to-head 2–1. Jung Woong Na extended the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2017-05-29 | Korea F1 | R32 | hard | Jung Woong Na | 6-3 6-3 |
| 2016-06-27 | Korea F3 | R32 | hard | Jung Woong Na | 2-6 6-3 6-3 |
| 2010-04-26 | Korea F4 | R32 | hard | Daniel Yoo | 6-3 6-0 |
Averages over each player's completed matches in the selected window (60 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