Gabriel Keymer defeated Sergio Cortes 6-2 6-4 in the Chile F1 qualifying round on clay. The upset overturned the form book — Sergio Cortes came in leading the head-to-head 1–0. Gabriel Keymer claimed a first win over Sergio Cortes in two meetings, levelling the head-to-head at 1–1.
Keymer G. took it in straight sets.
Gabriel Keymer beat Sergio Cortes 6-2 6-4. Umpiry, "Gabriel Keymer vs Sergio Cortes — Chile F1 Qualifying Round", https://umpiry.com/match/1998-11-16/cortes-vs-keymer-chile-f1-qf?utm_source=cite (as of 16 November 1998).