But it was far from a cakewalk for Federer, who came within two points of losing the first set before breaking twice in the second for a 7-6(2) 6-3 triumph over American teenager Frances Tiafoe. Next up for Federer is Juan Martin del Potro, who beat Dutchman Robin Haase 6-2 6-4 in a night match at Crandon Park. Federer has a 15-5 career record against del Potro, the 2009 U.S. Open champion. Top seed Wawrinka defeated Argentina’s Horacio Zeballos in 65 minutes, firing seven aces in a 6-3 6-4 victory in less than favourable morning conditions. Later, Austrian number six Dominic Thiem fell to Borna Coric 6-1 7-5.

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