Dylan Seong Kwan Kim defeated Byung Kook Kang 7-5 6-4 in the Korean Rep F5 round of 16 on hard. The upset overturned the form book — Byung Kook Kang came in leading the head-to-head 1–0. Dylan Seong Kwan Kim claimed a first win over Byung Kook Kang in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-04-27 | Korean Rep F4 | R32 | hard | Byung Kook Kang | 6-2 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.