Tetsuya Chaen defeated Akira Matsushita 2-6 6-3 7-5 in the Indonesia F4 round of 32 on hard. The upset overturned the form book — Akira Matsushita came in leading the head-to-head 4–1. Tetsuya Chaen narrowed the head-to-head to 4–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-06-07 | Japan 1 Masters 1 | QF | hard | Akira Matsushita | 6-1 6-1 |
| 1999-05-12 | Japan F3 | R32 | hard | Tetsuya Chaen | 5-7 6-0 6-0 |
| 1998-11-18 | Japan F5 | QF | hard | Akira Matsushita | 6-2 7-6 |
| 1998-10-07 | Japan F4 | QF | carpet | Akira Matsushita | 6-4 7-6 |
| 1997-11-17 | Japan 2 Masters 4 | SF | hard | Akira Matsushita | 3-6 7-6 7-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.