Oscar Hernandez defeated Martin Vassallo Arguello 6-3 6-3 in the Madrid Masters round of 64 on clay. The upset overturned the form book — Martin Vassallo Arguello came in leading the head-to-head 2–0. Oscar Hernandez claimed a first win over Martin Vassallo Arguello in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-02-02 | Vina del Mar | R32 | clay | Martin Vassallo Arguello | 6-3 7-6(1) |
| 2006-09-25 | Palermo | R16 | clay | Martin Vassallo Arguello | 2-6 6-4 6-4 |
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About
Averages over each player's completed matches in the selected window (62 vs 43). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About