Miguel Merz defeated Rodrigo Vallejo 7-6 6-4 in the Central America Masters 2 round of 32 on hard. The upset overturned the form book — Rodrigo Vallejo came in leading the head-to-head 1–0. Miguel Merz claimed a first win over Rodrigo Vallejo in two meetings, levelling the head-to-head at 1–1.
Merz M. took it in straight sets.
Hard: Merz M. leads 1–0 · Clay: Vallejo R. leads 1–0
Miguel Merz beat Rodrigo Vallejo 7-6 6-4. Umpiry, "Miguel Merz vs Rodrigo Vallejo — Central America Masters 2 Round of 32", https://umpiry.com/match/1994-01-29/merz-vs-vallejo-central-america-masters-2-r32?utm_source=cite (as of 29 January 1994).