Ji Sun Kim defeated Hae Sung Kim 6-4 6-2 in the Gimcheon 10K round of 16 on hard. The upset overturned the form book — Hae Sung Kim came in leading the head-to-head 2–0. Ji Sun Kim claimed a first win over Hae Sung Kim in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2012-10-22 | Seoul 25K | Q16 | hard | Hae Sung Kim | 7-6(4) 6-1 |
| 2010-05-24 | Goyang 25K | R32 | hard | Hae Sung Kim | 4-6 7-5 6-2 |