Sebastian Prieto defeated Juan Albert Viloca Puig 7-6 6-2 in the Palermo qualifying round of 16 on clay. The upset overturned the form book — Juan Albert Viloca Puig came in defending last year's round of 32, but Sebastian Prieto had been the form player, winning 1 of their last 4 on clay.
Prieto S. took it in straight sets.
Sebastian Prieto beat Juan Albert Viloca Puig 7-6(5) 6-2. Umpiry, "Sebastian Prieto vs Juan Albert Viloca Puig — Palermo Qualifying Round of 16", https://umpiry.com/match/2000-09-25/prieto-vs-puig-palermo-q16?utm_source=cite (as of 25 September 2000).