Thorsten Wolff defeated Matthias Muller 7-6 2-6 7-5 in the Germany F12 round of 32 on hard. The upset overturned the form book — Matthias Muller came in leading the head-to-head 2–0. Thorsten Wolff claimed a first win over Matthias Muller in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-05-01 | Turkey 1 Masters 3 | R32 | clay | Matthias Muller | 6-1 6-2 |
| 1998-08-05 | Switzerland 1 Masters 1 | SF | clay | Matthias Muller | 6-3 6-4 |