Thomas G Andersen defeated Mark Tjia 6-1 4-6 6-2 in the Mexico 2 Masters 4 qualifying round on hard. The upset overturned the form book — Mark Tjia came in leading the head-to-head 2–1. That levelled the head-to-head at 2–2.
Andersen T. came through in three sets.
Thomas G Andersen beat Mark Tjia 6-1 4-6 6-2. Umpiry, "Thomas G Andersen vs Mark Tjia — Mexico 2 Masters 4 Qualifying Round", https://umpiry.com/match/1994-04-09/andersen-vs-tjia-mexico-2-masters-4-qf?utm_source=cite (as of 9 April 1994).