Ji Sung Nam defeated Daniel Yoo 6-2 6-2 in the Seoul CH qualifying round 1 on hard. Ji Sung Nam extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2015-08-17 | Korea F4 | R16 | hard | Ji Sung Nam | 6-4 6-3 |
| 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 (159 vs 2). 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. Small sample — read as indicative. About