Young Jun Kim defeated Woong Sun Jun 6-3 6-3 in the Korea Rep F2 round of 32 on clay. The upset overturned the form book — Woong Sun Jun came in leading the head-to-head 2–0. Young Jun Kim claimed a first win over Woong Sun Jun in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2012-05-21 | Korea F2 | R16 | hard | Woong Sun Jun | 7-6(7) 1-6 7-6(3) |
| 2004-05-03 | Korea Rep F1 | R16 | hard | Woong Sun Jun | 5-7 6-4 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.