Diego Junqueira defeated Martin Vassallo Arguello 3-6 6-4 6-3 in the Argentina F6 qualifying round on clay. The upset overturned the form book — Martin Vassallo Arguello came in leading the head-to-head 1–0, but Diego Junqueira had been the form player, winning 2 of their last 4 on clay. Diego Junqueira claimed a first win over Martin Vassallo Arguello in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-09-27 | Bolivia F2 | R16 | clay | Martin Vassallo Arguello | 6-4 6-4 |
Averages over each player's completed matches in the selected window (43 vs 123). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About