Ji Sung Nam defeated Hong Chung 7-5 6-4 in the Korea F3 round of 32 on hard. The upset overturned the form book — Hong Chung came in leading the head-to-head 1–0, but Ji Sung Nam had been the form player, winning 6 of their last 7 on hard. Ji Sung Nam claimed a first win over Hong Chung in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-05-16 | Korea F1 | R32 | hard | Hong Chung | 7-6(0) 7-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.