Tetsuya Chaen defeated Patrick Erhardt 6-1 6-2 in the Japan 2 Masters 4 qualifying round on hard. The result followed the form book — Tetsuya Chaen came in leading the head-to-head 2–0. Tetsuya Chaen extended the head-to-head to 3–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-11-25 | Japan F6 | R32 | hard | Tetsuya Chaen | 6-3 3-6 6-4 |
| 1997-11-17 | Japan 2 Masters 4 | QF | hard | Tetsuya Chaen | 7-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.