Stefan Seifert defeated Marcel Zimmermann 7-6 6-2 in the Germany F18 round of 32 on carpet. The upset overturned the form book — Marcel Zimmermann came in leading the head-to-head 1–0. Stefan Seifert claimed a first win over Marcel Zimmermann in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-10-02 | Germany 1 Satellite 2 | R32 | carpet | Marcel Zimmermann | 6-2 7-6(3) |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.