Hyung Tae Kwon defeated Tetsuya Chaen 6-2 2-6 7-5 in the Japan F3 round of 16 on hard. The upset overturned the form book — Tetsuya Chaen came in leading the head-to-head 1–0. Hyung Tae Kwon claimed a first win over Tetsuya Chaen in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2005-05-23 | Japan F4 | R32 | hard | Tetsuya Chaen | 6-4 2-1 |