Leonardo Olguin defeated Gustavo Diaz 6-4 6-4 in the Brazil 3 Masters 1 round of 32 on clay. The upset overturned the form book — Gustavo Diaz came in leading the head-to-head 1–0, but Leonardo Olguin had been the form player, winning 5 of their last 8 on clay. Leonardo Olguin claimed a first win over Gustavo Diaz in two meetings, levelling the head-to-head at 1–1.
Olguin L. took it in straight sets.
Leonardo Olguin beat Gustavo Diaz 6-4 6-4. Umpiry, "Leonardo Olguin vs Gustavo Diaz — Brazil 3 Masters 1 Round of 32", https://umpiry.com/match/1996-06-01/diaz-vs-olguin-brazil-3-masters-1-r32?utm_source=cite (as of 1 June 1996).