Joao Fonseca defeated Fabian Marozsan 6–4, 3–6, 6–2 in the first round of the Miami Masters on hard court. As the pre-match favourite with odds of 1.35, Fonseca delivered as expected against the 3.07 outsider Marozsan. After dropping the second set, Fonseca regrouped decisively in the third, securing a commanding performance to advance. The result confirms Fonseca's status as a rising force on the Masters 1000 circuit.