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 1–0. Kresimir Ritz claimed a first win over Oliver Marach in two meetings, levelling the head-to-head at 1–1.
Ritz K. came through in three sets.
Kresimir Ritz beat Oliver Marach 3-6 6-1 6-2. Umpiry, "Kresimir Ritz vs Oliver Marach — Austria F1 Round of 16", https://umpiry.com/match/2000-05-01/marach-vs-ritz-austria-f1-r16?utm_source=cite (as of 1 May 2000).