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.
Olguin L. took it in straight sets.
Leonardo Olguin beat Sebastian Prieto 6-4 6-3. Umpiry, "Leonardo Olguin vs Sebastian Prieto — Argentina 3 Masters 2 Round of 32", https://umpiry.com/match/1996-09-28/olguin-vs-prieto-argentina-3-masters-2-r32?utm_source=cite (as of 28 September 1996).