Kresimir Ritz defeated Oliver Marach 3-6 6-1 6-2 in the Austria F1 round of 16 on clay. The upset overturned the form book — Oliver Marach came in leading the head-to-head 2–0. Kresimir Ritz claimed a first win over Oliver Marach in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2000-07-17 | Umag | Q16 | clay | Oliver Marach | 6-3 6-4 |
| 1999-07-26 | Slovenia F3 | SF | clay | Oliver Marach | 6-2 7-6 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.