Grega Zemlja defeated Marcel Zimmermann 7-5 6-3 in the Germany F15 semi-final on clay. The result followed the form book — Grega Zemlja came in leading the head-to-head 2–1. Grega Zemlja extended 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 |
| 2006-02-20 | Croatia F2 | R32 | hard | Marcel Zimmermann | 5-7 7-5 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.