Woong Sun Jun defeated Ilyoung Jeong 7-6 7-5 in the Korea F4 round of 32 on hard. The result followed the form book — Woong Sun Jun came in leading the head-to-head 2–0. Woong Sun Jun extended the head-to-head to 3–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2015-08-24 | Korea F5 | Q64 | hard | Woong Sun Jun | 6-3 6-4 |
| 2013-05-20 | Korea F3 | Q32 | hard | Woong Sun Jun | 6-0 6-0 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.