Jung Woong Na defeated Seong Chan Hong 6-4 6-2 in the Korea F3 semi-final on hard. The upset overturned the form book — Seong Chan Hong came in leading the head-to-head 3–0, but Jung Woong Na had been the form player, winning 5 of their last 10 on hard. Jung Woong Na claimed a first win over Seong Chan Hong in four meetings, narrowing the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2019-06-09 | M15 Daegu 1 | F | hard | Seong Chan Hong | 6-0 6-3 |
| 2017-06-26 | Korea F5 | R16 | clay | Seong Chan Hong | 6-4 2-6 7-6(6) |
| 2015-08-24 | Korea F5 | R16 | hard | Seong Chan Hong | 7-6(9) 1-6 6-4 |
Averages over each player's completed matches in the selected window (62 vs 200). ATP, WTA & Challenger.
Chan Hong S.: 4 days rest · 1 match, 17 games (7d). Higher means fresher. About
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About