Guilherme Ochiai defeated Tetsuya Chaen 7-6 6-1 in the Japan F7 round of 16 on clay. The upset overturned the form book — Tetsuya Chaen came in leading the head-to-head 1–0. Guilherme Ochiai claimed a first win over Tetsuya Chaen in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2005-05-30 | Japan F5 | R32 | hard | Tetsuya Chaen | 0-6 7-5 7-5 |