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.
The 19-year-old Zverev saved four of five break points and won 75 per cent of his service points.
"I had to be aggressive. I felt like he was the one controlling all the points all the time, so I had to change that. It worked out well for me," Zverev said.
The German, seeded 16th, will now face Australian Nick Kyrgios, who was impressive in a 7-6 (7/5) 6-3 win over Belgian David Goffin.
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