Roberto Alvarez defeated Patricio Rudi 6-3 6-3 in the Argentina F3 qualifying round on clay. The upset overturned the form book — Patricio Rudi came in leading the head-to-head 1–0, but Roberto Alvarez had been the form player, winning 3 of their last 8 on clay. Roberto Alvarez claimed a first win over Patricio Rudi in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-11-23 | Uruguay F1 | R32 | clay | Patricio Rudi | 7-6 6-2 |