Rodrigo Pacheco Mendez defeated Aleksandar Vukic 7–5, 4–6, 7–6 in the first round of the ATP 250 event at Acapulco on hard court, pulling off a significant upset against the pre-match favourite. Vukic, priced at 1.26 to win, was unable to convert his seeding advantage, whilst Pacheco Mendez capitalised on his opportunities in a closely contested match that went to a deciding tie-break. The Argentine's comeback from a set down and his composure in the third set demonstrated resilience under pressure. The victory marks a statement win for Pacheco Mendez and suggests momentum heading into the second round.