Carlos Avellan defeated Sebastian Quintero 6-1 6-2 in the Bolivia F1 round of 16 on clay. The upset overturned the form book — Sebastian Quintero came in leading the head-to-head 2–0, but Carlos Avellan had been the form player, winning 4 of their last 6 on clay. Carlos Avellan claimed a first win over Sebastian Quintero in three meetings, narrowing the head-to-head to 2–1.
Avellan C. took it in straight sets.
Carlos Avellan beat Sebastian Quintero 6-1 6-2. Umpiry, "Carlos Avellan vs Sebastian Quintero — Bolivia F1 Round of 16", https://umpiry.com/match/2004-09-20/avellan-vs-quintero-bolivia-f1-r16?utm_source=cite (as of 20 September 2004).