Alexander Zverev outguns Nick Kyrgios in Miami Open pre-quarters

Nick Kyrgios crashed out of the Miami Open with a straight-sets fourth-round loss to world number five Alexander Zverev.

Alexander Zverev returns to Nick Kyrgios during the Miami Open tennis tournament. | AP 

Nick Kyrgios returns a shot to Alexander Zverev during the Miami Open tennis tournament. | AP

Alexander Zverev returns to Nick Kyrgios during the Miami Open tennis tournament. | AP

Nick Kyrgios prepares to hit a forehand to Alexander Zverev during the Miami Open. | AP

Alexander Zverev returns the ball to Nick Kyrgios during the Miami Open tennis tournament. | AP

Nick Kyrgios suffered a 6-4 6-4 fourth-round loss to Alexander Zverev at Miami Open. | AP

This is Nick Kyrgios' second straight loss to Alexander Zverev. | AP

Alexander Zverev waves to the crowd after defeating Nick Kyrgios at the Miami Open tennis tournament. | AP