Marcel Zimmermann defeated Tobias Klein 6-0 6-2 in the Germany F15 qualifying round on clay. The upset overturned the form book — Tobias Klein came in leading the head-to-head 1–0, but Marcel Zimmermann had been the form player, winning 5 of their last 7 on clay. Marcel Zimmermann claimed a first win over Tobias Klein in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-03-06 | Switzerland F2 | SF | carpet | Tobias Klein | 4-6 6-3 7-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.