Filip Horansky defeated Mario Vilella Martinez 7-6 6-3 in the ATP Rio de Janeiro qualifying round 1 on clay. The upset overturned the form book — Mario Vilella Martinez came in leading the head-to-head 1–0, but Filip Horansky had been the form player, winning 1 of their last 4 on clay. Filip Horansky claimed a first win over Mario Vilella Martinez in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2021-05-31 | Roland Garros | Q2 | clay | Mario Vilella Martinez | 6-2 6-3 |
Averages from each player's recent completed matches (6 vs 10). ATP, WTA & Challenger.