Nick Kyrgios is through to the last eight at the Miami Masters courtesy of a straight sets demolition of Russian Andrey Kuznetsov.

After a tight first set which the Australian took in a tie-break after both players managed a break of serve, Kyrgios dominated the second set to run out a 7-6 (7-3) 6-3 winner in 83 minutes.

The world No.26, who is yet to drop a set this tournament, now faces a quarter-final against the winner of the next match up on Grandstand Court between Damir Dzumhur and Canadian world No.12 Milos Raonic.