Byung Kook Kang defeated Dylan Seong Kwan Kim 6-2 6-1 in the Korean Rep F4 round of 32 on hard. The upset overturned the form book — Dylan Seong Kwan Kim came in leading the head-to-head 1–0, but Byung Kook Kang had been the form player, winning 4 of their last 8 on hard. Byung Kook Kang claimed a first win over Dylan Seong Kwan Kim in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-07-13 | Korean Rep F5 | R16 | hard | Dylan Seong Kwan Kim | 7-5 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.