Vilim Visak defeated Kresimir Ritz 6-4 2-6 6-1 in the Croatia F4 round of 16 on clay. The upset overturned the form book — Kresimir Ritz came in leading the head-to-head 2–0. Vilim Visak claimed a first win over Kresimir Ritz in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-06-05 | Slovenia F2 | R32 | clay | Kresimir Ritz | 6-3 6-7(4) 6-2 |
| 2003-08-25 | Croatia F5 | R32 | clay | Kresimir Ritz | 6-2 6-3 |