AFP, Miami :
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 quarter-final.
Roger Federer, Rafael Nadal and Kei Nishikori advanced to the quarter-finals 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.
