Ji Hee Lee defeated Se Jin Lee 6-2 7-6 in the Sunchang 10K round of 32 on hard. The upset overturned the form book — Se Jin Lee came in leading the head-to-head 2–0, but Ji Hee Lee had been the form player, winning 5 of their last 10 on hard. Ji Hee Lee claimed a first win over Se Jin Lee in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2015-08-17 | Gimcheon $10K | R32 | hard | Se Jin Lee | 5-7 6-1 7-5 |
| 2012-06-25 | Incheon 25K | Q64 | hard | Se Jin Lee | 6-2 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.