Toshihide Matsui defeated Tetsuya Chaen 6-2 6-3 in the Japan F8 qualifying round on hard. The upset overturned the form book — Tetsuya Chaen came in leading the head-to-head 2–1. Toshihide Matsui narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2001-09-24 | Japan F8 | R32 | hard | Toshihide Matsui | 6-4 6-3 |
| 2001-03-19 | Japan F2 | R32 | carpet | Tetsuya Chaen | 6-3 6-3 |
| 2001-03-12 | Japan F1 | R16 | carpet | Tetsuya Chaen | 7-6(5) 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.