Leonardo Olguin defeated Mariano Puerta 4-6 6-4 6-3 in the Argentina 1 Masters 4 round of 32 on clay. The upset overturned the form book — Mariano Puerta came in leading the head-to-head 1–0. Leonardo Olguin claimed a first win over Mariano Puerta in two meetings, levelling the head-to-head at 1–1.
Olguin L. came through in three sets.
Leonardo Olguin beat Mariano Puerta 4-6 6-4 6-3. Umpiry, "Leonardo Olguin vs Mariano Puerta — Argentina 1 Masters 4 Round of 32", https://umpiry.com/match/1996-08-03/olguin-vs-puerta-argentina-1-masters-4-r32?utm_source=cite (as of 3 August 1996).