Martin Vassallo Arguello defeated Stan Wawrinka 7-5 1-6 6-4 in the Gstaad round of 32 on clay. The upset overturned the form book — Stan Wawrinka came in leading the head-to-head 2–0, defending last year's round of 32, but Martin Vassallo Arguello had been the form player, winning 1 of their last 4 on clay. Martin Vassallo Arguello claimed a first win over Stan Wawrinka in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-06-22 | Wimbledon | R64 | grass | Stan Wawrinka | 6-3 6-2 6-2 |
| 2009-04-12 | Monte Carlo Masters | R32 | clay | Stan Wawrinka | 2-6 7-5 6-2 |
Averages over each player's completed matches in the selected window (91 vs 198). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About
Wawrinka S.: 2 days rest · 2 matches, 45 games (7d). Higher means fresher. About
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About
Per-surface Serve / Return Rating (0–100, percentile within the clay field, opponent-adjusted over 52 weeks). About