Marcel Zimmermann defeated Grega Zemlja 5-7 7-5 6-2 in the Croatia F2 round of 32 on hard. The upset overturned the form book — Grega Zemlja came in leading the head-to-head 3–0. Marcel Zimmermann claimed a first win over Grega Zemlja in four meetings, narrowing the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-05-26 | Slovenia F1 | F | clay | Grega Zemlja | 4-6 6-4 6-1 |
| 2007-10-08 | Germany F19 | F | hard | Grega Zemlja | 6-3 7-5 |
| 2006-09-04 | Germany F15 | SF | clay | Grega Zemlja | 7-5 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.