Sang Oh Oh defeated Woong Sun Jun 2-6 7-5 6-3 in the Korea F1 q16 on hard. The upset overturned the form book — Woong Sun Jun came in leading the head-to-head 2–0, but Sang Oh Oh had been the form player, winning 2 of their last 5 on hard. Sang Oh Oh 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 |
|---|---|---|---|---|---|
| 2014-06-16 | Korea F6 | R16 | hard | Woong Sun Jun | 6-3 6-4 |
| 2013-05-27 | Korea F4 | Q16 | hard | Woong Sun Jun | 6-0 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.