World No. 1 Carlos Alcaraz powered past Brazilian teenager Joao Fonseca 6-4, 6-4 to reach the third round of the Miami Open.
The Spaniard, now 17-1 this season, next faces American Sebastian Korda.
Britain’s Jack Draper fell to Reilly Opelka in two tie-break sets, undone by 25 aces from the American.
Norway’s Casper Ruud also exited, stunned by Ethan Quinn, who saved seven set points to win 6-4, 7-6.
Japanese wildcard Rei Sakamoto celebrated his first ATP victory, edging Aleksandar Kovacevic in a deciding tie-break to set up a clash with Daniil Medvedev.
