Mariano Zabaleta defeated Nicolas Massu 6-4 3-6 6-1 in the Casablanca round of 16 on clay. The upset overturned the form book — Nicolas Massu came in leading the head-to-head 5–2, but Mariano Zabaleta had been the form player, winning 3 of their last 8 on clay. Mariano Zabaleta narrowed the head-to-head to 5–3.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-07-10 | Bastad | R32 | clay | Nicolas Massu | 6-4 3-1 RET |
| 2004-10-25 | Basel | R16 | hard | Nicolas Massu | 6-2 6-4 |
| 2004-07-19 | Kitzbuhel | QF | clay | Nicolas Massu | 7-6(4) 7-6(6) |
| 2004-05-03 | Rome Masters | QF | clay | Mariano Zabaleta | 6-1 7-5 |
| 2003-07-21 | Kitzbuhel | SF | clay | Nicolas Massu | 6-2 6-1 |
| 2003-07-07 | Bastad | R32 | clay | Mariano Zabaleta | 2-6 6-3 6-3 |
| 2000-10-16 | Shanghai | R32 | carpet | Nicolas Massu | 6-4 7-6(5) |
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.