Felix Mantilla defeated Mariano Zabaleta 4-6 7-5 6-3 4-6 6-4 in the Australian Open round of 128 on hard. The upset overturned the form book — Mariano Zabaleta came in leading the head-to-head 4–3, defending last year's round of 128. Felix Mantilla narrowed the head-to-head to 4–4.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-05-03 | Rome Masters | R32 | clay | Mariano Zabaleta | 7-5 6-3 |
| 2001-09-24 | Palermo | QF | clay | Felix Mantilla | 6-0 2-0 RET |
| 2001-01-08 | Auckland | R32 | hard | Mariano Zabaleta | 7-5 7-5 |
| 2000-01-17 | Australian Open | R128 | hard | Mariano Zabaleta | 6-1 5-7 6-3 7-6(5) |
| 1999-05-10 | Rome Masters | R64 | clay | Felix Mantilla | 6-1 RET |
| 1998-11-09 | Santiago | R32 | clay | Felix Mantilla | 6-2 6-3 |
| 1998-08-03 | Amsterdam | R32 | clay | Mariano Zabaleta | 7-6(2) 6-2 |
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 (109 vs 166). ATP, WTA & Challenger.