Juan Martin Aranguren defeated Marko Neunteibl 6-2 7-5 in the Chile 1 2 round of 16 on clay. The upset overturned the form book — Marko Neunteibl came in leading the head-to-head 1–0, but Juan Martin Aranguren had been the form player, winning 4 of their last 10 on clay. Juan Martin Aranguren claimed a first win over Marko Neunteibl in two meetings, levelling the head-to-head at 1–1.
Aranguren J. took it in straight sets.
Juan Martin Aranguren beat Marko Neunteibl 6-2 7-5. Umpiry, "Juan Martin Aranguren vs Marko Neunteibl — Chile 1 2 Round of 16", https://umpiry.com/match/2004-03-08/aranguren-vs-neunteibl-chile-1-2-r16?utm_source=cite (as of 8 March 2004).