Juan Pablo Guzman defeated Edgardo Massa 3-6 6-4 6-1 in the Argentina F4 round of 32 on clay. The upset overturned the form book — Edgardo Massa came in leading the head-to-head 1–0, but Juan Pablo Guzman had been the form player, winning 3 of their last 5 on clay. Juan Pablo Guzman claimed a first win over Edgardo Massa in two meetings, levelling the head-to-head at 1–1.
Guzman J. came through in three sets.
Juan Pablo Guzman beat Edgardo Massa 3-6 6-4 6-1. Umpiry, "Juan Pablo Guzman vs Edgardo Massa — Argentina F4 Round of 32", https://umpiry.com/match/2000-05-08/guzman-vs-massa-argentina-f4-r32?utm_source=cite (as of 8 May 2000).