Hae Sung Kim defeated Ji Sun Kim 7-6 6-1 in the Seoul 25K q16 on hard. Hae Sung Kim extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2010-05-24 | Goyang 25K | R32 | hard | Hae Sung Kim | 4-6 7-5 6-2 |
| 2009-06-29 | Gimcheon 10K | R16 | hard | Ji Sun Kim | 6-4 6-2 |