MIAMI (AFP) - 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.
Zverev's win earned him his first place in a Masters 1000 quarter-final and he will face the winner of Tuesday's late game between Australian Nick Kyrgios and Belgian David Goffin.
Roger Federer, Rafael Nadal and Kei Nishikori advanced to the quarter-finals on cue.
Federer had to work hard for his victory against 14th seed Roberto Bautista Agut, emerging with a 7-6 (7/5) 7-6(7/4) win setting up a last eight meeting with Czech Tomas Berdych, the 10th seed, a 6-3, 7-5 winner over France's Adrian Mannarino.
Nadal beat France's Nicolas Mahut 6-4, 7-6 (7/4) in a tightly fought contest and will face American Jack Sock who comfortably beat his compatriot Jared Donaldson 6-2, 6-1.
The Spaniard, who has never won the Miami title, got the only break of the match to go 5-4 up in the first set.
Second-seed Nishikori, of Japan, survived a second set scare against Argentine Federico del Bonis en route to a 6-3, 4-6, 6-3.
Nishikori, who lost to Novak Djokovic in last year's Miami final, will face Italian Fabio Fognini who defeated American Donald Young 6-0 6-4.