Andy Murray powers through at Miami Masters

Defending champion Andy Murray has made it into the fourth round of the Miami Masters with a straight-sets victory over Feliciano Lopez.

The world number six was in a determined mood during the opening set, taking it 6-4 against the Spaniard.

Murray's former coach Ivan Lendl was in attendance inside the stadium to watch the Brit break early in the second on his way to closing out the match 6-1.

Waiting for Murray in the next round will be 11th seed Jo-Wilfried Tsonga following his straight-sets triumph over Marcos Baghdatis.