Tomáš Macháč defeated Matteo Arnaldi 6–2, 1–6, 6–3 in the first round of the Miami Masters on hard court, confirming his pre-match favourite status with odds of 1.52 to Arnaldi's 2.68. After Macháč claimed a dominant opening set, Arnaldi responded emphatically in the second to level the match, but the Czech player regained control in the decider to secure his passage. The result extends Macháč's winning record at this stage of Masters events and positions him favourably in his pursuit of deeper tournament runs this season.