Sung Keun Jeong defeated Dong Hak Sin 6-4 6-2 in the Korea F7 q32 on clay. The upset overturned the form book — Dong Hak Sin came in leading the head-to-head 1–0. Sung Keun Jeong claimed a first win over Dong Hak Sin in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2013-06-10 | Korea F6 | Q32 | hard | Dong Hak Sin | 7-5 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.