Miha Gregorc defeated Oliver Marach 7-6 6-2 in the USA F18 round of 16 on hard. The upset overturned the form book — Oliver Marach came in leading the head-to-head 1–0. Miha Gregorc claimed a first win over Oliver Marach in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-03-08 | Mexico F1 | R16 | hard | Oliver Marach | 6-2 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.