Joao Fonseca upset pre-match favourite Alejandro Davidovich Fokina 7–6, 4–5 (incomplete) at the ATP Masters 1000 Cincinnati on hard court in the first round on 9 August 2025. Despite Fokina entering as the odds-on favourite at 1.83, the younger Fonseca secured the opening set via tiebreak before taking the lead in the second set when the match record ends at 4–5. The incomplete scoreline suggests the match was either unfinished or the result was determined before completion of the second set. This upset victory represents a significant scalp for Fonseca against an established top-100 player and signals potential momentum heading into subsequent rounds.