Matthias Muller defeated Thorsten Wolff 6-3 6-4 in the Switzerland 1 Masters 1 semi-final on clay. Matthias Muller extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-10-04 | Germany F12 | R32 | hard | Thorsten Wolff | 7-6 2-6 7-5 |
| 1999-05-01 | Turkey 1 Masters 3 | R32 | clay | Matthias Muller | 6-1 6-2 |