Tetsuya Chaen defeated Toshiharu Kato 7-6 7-5 in the Japan F4 round of 32 on carpet. The result followed the form book — Tetsuya Chaen came in leading the head-to-head 4–0. Tetsuya Chaen extended the head-to-head to 5–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2007-10-22 | Japan F11 | R32 | hard | Tetsuya Chaen | 6-2 6-2 |
| 2006-09-18 | Japan F10 | R16 | carpet | Tetsuya Chaen | 6-1 7-5 |
| 2000-09-18 | Japan F7 | QF | hard | Tetsuya Chaen | 6-2 3-1 |
| 1999-10-25 | Japan F6 | R32 | carpet | Tetsuya Chaen | 0-6 6-1 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.