Tetsuya Chaen advanced when Hyung Tae Kwon retired 6-4 2-1 in the Japan F4 round of 32. Tetsuya Chaen claimed a first win over Hyung Tae Kwon in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-03-31 | Japan F3 | R16 | hard | Hyung Tae Kwon | 6-2 2-6 7-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.