Marcel Zimmermann defeated Alexander Flock 3-6 6-4 6-3 in the Croatia F7 qualifying round on clay. The upset overturned the form book — Alexander Flock came in leading the head-to-head 1–0. Marcel Zimmermann claimed a first win over Alexander Flock in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2010-09-27 | Portugal F4 | QF | clay | Alexander Flock | 7-6(2) 6-4 |