Jung Woong Na defeated Chu Huan Yi 6-1 6-1 in the Japan F9 round of 32 on hard. The upset overturned the form book — Chu Huan Yi came in leading the head-to-head 2–0, but Jung Woong Na had been the form player, winning 4 of their last 7 on hard. Jung Woong Na claimed a first win over Chu Huan Yi in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-05-30 | Korea F3 | R32 | hard | Chu Huan Yi | 6-4 6-3 |
| 2011-05-23 | Korea F2 | R32 | hard | Chu Huan Yi | 7-6(4) 3-6 6-4 |
Averages over each player's completed matches in the selected window (62 vs 19). 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