Antonio Pastorino defeated Marko Neunteibl 6-3 6-4 in the Argentina 4 semi-final on clay. The upset overturned the form book — Marko Neunteibl came in leading the head-to-head 2–0, but Antonio Pastorino had been the form player, winning 5 of their last 10 on clay. Antonio Pastorino claimed a first win over Marko Neunteibl in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2003-10-27 | Argentina F5 | R32 | clay | Marko Neunteibl | 7-5 6-1 |
| 2002-10-14 | Chile F6 | QF | clay | Marko Neunteibl | 2-6 6-4 3-0 |