Soong Jae Cho defeated Woong Sun Jun 5-7 6-2 6-2 in the Korea F8 round of 16 on hard. The upset overturned the form book — Woong Sun Jun came in leading the head-to-head 3–0. Soong Jae Cho claimed a first win over Woong Sun Jun in four meetings, narrowing the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2014-06-30 | Korea F8 | R16 | hard | Woong Sun Jun | 6-2 5-7 6-3 |
| 2010-04-19 | Korea F3 | R16 | hard | Woong Sun Jun | 6-4 6-4 |
| 2010-04-12 | Korea F2 | R32 | hard | Woong Sun Jun | 6-2 6-3 |
Averages over each player's completed matches in the selected window (1 vs 6). 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