Result: Andy Murray powers through at Miami Masters

Andy Murray of Great Britain celebrates a point in his fourth round match against Stephane Robert of France during day eight of the 2014 Australian Open at Melbourne Park on January 20, 2014
© Getty Images
Defending champion Andy Murray is through to round four of the Miami Masters with a 6-4 6-1 victory over Feliciano Lopez.

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.

Andy Murray of Great Britain serves as his coach Ivan Lendl looks on during training on day 10 of the 2013 Australian Open on January 23, 2013
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ATP RankingsPoints
1Scotland flag Andy Murray7,750
2Spain Rafael Nadal7,555
3Switzerland Roger Federer7,145
4Switzerland Stanislas Wawrinka5,780
5Serbia Novak Djokovic5,325
6Croatia Marin Cilic5,155
7Alexander Zverev4,470
8Austria Dominic Thiem4,030
9Japan Kei Nishikori3,285
10Canada Milos Raonic3,230
11Bulgaria Grigor Dimitrov3,070
12France Jo-Wilfried Tsonga2,770
13Belgium David Goffin2,560
14Spain Roberto Bautista Agut2,425
15Czech Republic Tomas Berdych2,390
16United States Jack Sock2,335
17Pablo Carreno Busta2,305
18Lucas Pouille2,220
19United States John Isner2,110
20United States Sam Querrey2,060