Sebastian Uriarte defeated Edgardo Massa 6-1 6-2 in the Argentina F5 round of 32 on clay. The upset overturned the form book — Edgardo Massa came in leading the head-to-head 1–0, but Sebastian Uriarte had been the form player, winning 3 of their last 5 on clay. Sebastian Uriarte claimed a first win over Edgardo Massa in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-07-31 | Argentina 2 Masters 4 | R32 | clay | Edgardo Massa | 6-4 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.