Armando Perez defeated Marco Osorio 6-2 6-4 in the Cuba Mexico Masters 3 round of 16 on hard. The upset overturned the form book — Marco Osorio came in leading the head-to-head 2–1. That levelled the head-to-head at 2–2.
Perez A. took it in straight sets.
Hard: Perez A. leads 2–1 · Clay: Osorio M. leads 1–0
Armando Perez beat Marco Osorio 6-2 6-4. Umpiry, "Armando Perez vs Marco Osorio — Cuba Mexico Masters 3 Round of 16", https://umpiry.com/match/1998-02-07/osorio-vs-perez-cuba-mexico-masters-3-r16?utm_source=cite (as of 7 February 1998).