So Jung Kim defeated Ji Hee Choi 6-1 6-2 in the Incheon 25K qualifying round on hard. The upset overturned the form book — Ji Hee Choi came in leading the head-to-head 3–0, but So Jung Kim had been the form player, winning 5 of their last 10 on hard. So Jung Kim claimed a first win over Ji Hee Choi in four meetings, narrowing the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2015-08-17 | Gimcheon $10K | R32 | hard | Ji Hee Choi | 6-4 6-3 |
| 2013-10-28 | Seoul 25K | R32 | hard | Ji Hee Choi | 6-4 6-3 |
| 2012-10-22 | Seoul 25K | R32 | hard | Ji Hee Choi | 3-6 6-3 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.