Roger Federer beat American teenager Frances Tiafoe in his first match at the Miami Open for three years.
The Swiss, 35, defeated the 19-year-old qualifier 7-6 (7-2), 6-3 to take his 2017 record to 14 wins and one loss.
Federer, who won has won the Australian Open and Indian Wells titles this year, missed Miami through illness in 2016.
Top seed Stan Wawrinka beat Horacio Zeballos 6-3 6-4, while women’s fifth seed Agnieszka Radwanska was thrashed 6-0, 6-3 by Mirjana Lucic-Baroni.
“It’s quite tough conditions, raining and really windy today,” Swiss Wawrinka said.
“It’s really windy on the court, so it’s never easy. I’m happy with the way I was moving, the way I was playing and my attitude in general was really positive, so it’s a great match.”
Federer picked up where he left off in Indian Wells, winning his first 20 service points on the way to overcoming an impressive effort from Tiafoe, the world number 101.
Muguruza had to fight from a set down for the second match in a row
“I’ve hit with Frances maybe twice before,” Federer said.
“I saw the power he had, the explosivity he had, how he easily can generate pace. He seemed to be fearless, good serving, taking the ball early and making the plays.
“What I like to see is when a younger player comes out and really feels he has nothing to lose and only has stuff to gain.”
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