Roberto Alvarez defeated Martin Vassallo Arguello 6-1 7-5 in the Argentina F5 round of 16 on clay. The result followed the form book — Roberto Alvarez came in leading the head-to-head 1–0. Roberto Alvarez extended the head-to-head to 2–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-10-11 | Paraguay F1 | QF | clay | Roberto Alvarez | 6-4 7-6 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.