Leonardo Olguin defeated Sebastian Prieto 6-4 6-3 in the Argentina 3 Masters 2 round of 32 on clay. The upset overturned the form book — Sebastian Prieto came in leading the head-to-head 3–0, but Leonardo Olguin had been the form player, winning 2 of their last 4 on clay. Leonardo Olguin claimed a first win over Sebastian Prieto in four meetings, narrowing the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1995-08-05 | Argentina B Masters 1 | R16 | clay | Sebastian Prieto | 4-6 6-3 7-6 |
| 1994-07-16 | Argentina 2 Masters 1 | R32 | clay | Sebastian Prieto | 6-2 6-4 |
| 1992-08-10 | Argentina 2 Masters 4 | R32 | clay | Sebastian Prieto | 2-6 6-2 6-4 |
Averages over each player's completed matches in the selected window (1 vs 13). 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. Small sample — read as indicative. About