Mariano Zabaleta defeated Gaston Gaudio 6-3 6-3 in the Hamburg Masters round of 64 on clay. The upset overturned the form book — Gaston Gaudio came in leading the head-to-head 4–2, but Mariano Zabaleta had been the form player, winning 3 of their last 8 on clay. Mariano Zabaleta narrowed the head-to-head to 4–3.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-07-17 | Stuttgart | R32 | grass | Mariano Zabaleta | 6-4 6-0 |
| 2005-07-25 | Kitzbuhel | SF | clay | Gaston Gaudio | 6-1 6-1 |
| 2005-07-18 | Stuttgart | QF | grass | Gaston Gaudio | 6-4 1-6 6-2 |
| 2004-07-05 | Bastad | F | clay | Mariano Zabaleta | 6-1 4-6 7-6(4) |
| 2001-02-19 | Buenos Aires | R32 | clay | Gaston Gaudio | 6-4 6-3 |
| 1999-09-27 | Bucharest | R32 | clay | Gaston Gaudio | 6-2 6-7(5) 3-1 RET |
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 (200 vs 200). ATP, WTA & Challenger.