Ji Sung Nam defeated Daniel Yoo 6-4 6-3 in the Korea F4 round of 16 on hard. The upset overturned the form book — Daniel Yoo came in leading the head-to-head 1–0, but Ji Sung Nam had been the form player, winning 2 of their last 6 on hard. Ji Sung Nam claimed a first win over Daniel Yoo in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2012-05-14 | China F7 | R16 | hard | Daniel Yoo | 7-5 3-6 6-0 |
Averages over each player's completed matches in the selected window (170 vs 22). 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