Antonio Pastorino defeated Diego Junqueira 6-3 6-1 in the Argentina F9 round of 32 on clay. The upset overturned the form book — Diego Junqueira came in leading the head-to-head 3–1, but Antonio Pastorino had been the form player, winning 4 of their last 9 on clay. Antonio Pastorino narrowed the head-to-head to 3–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2005-04-25 | Italy F10 | R32 | clay | Diego Junqueira | 2-6 6-2 6-1 |
| 2004-11-15 | Uruguay F1 | F | clay | Diego Junqueira | 6-0 4-6 7-5 |
| 2003-11-03 | Argentina F6 | R32 | clay | Antonio Pastorino | 6-1 6-1 |
| 2001-05-07 | Argentina F6 | R32 | clay | Diego Junqueira | 6-1 7-6(2) |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.