Top seed Stan Wawrinka crashed out of the Miami Open on Tuesday, falling 4-6, 6-2, 6-1 to German young gun Alexander Zverev, who booked his first Masters 1000 quarterfinal.
Roger Federer, Rafael Nadal and Kei Nishikori advanced to the quarterfinals on cue.
But Wawrinka, beaten by fellow Swiss Federer in the final of Indian Wells earlier this month, looked weary as he struggled through the third set of a match played on his 32nd birthday.
“I had one bad game to start the second set and then it was tough for me,” Wawrinka, the reigning US Open champion, said. “I don’t know. I completely went down physically and mentally, and also my tennis was completely out. I had no more gas.”
“For sure it’s a disappointing match. I think the level was quite up and down. We were both fighting a little bit in the first set to find good level. It was really humid, not easy to play some great tennis,” he added.