Oliver Marach defeated Miha Gregorc 6-2 6-4 in the Mexico F1 round of 16 on hard. The upset overturned the form book — Miha Gregorc came in leading the head-to-head 1–0, but Oliver Marach had been the form player, winning 1 of their last 4 on hard. Oliver Marach claimed a first win over Miha Gregorc in two meetings, levelling the head-to-head at 1–1.
Marach O. took it in straight sets.
Oliver Marach beat Miha Gregorc 6-2 6-4. Umpiry, "Oliver Marach vs Miha Gregorc — Mexico F1 Round of 16", https://umpiry.com/match/2004-03-08/gregorc-vs-marach-mexico-f1-r16?utm_source=cite (as of 8 March 2004).