Murray cruises to quarters in less than an hour

ANDY Murray blew Viktor Troicki off court in just 58 minutes as he advanced to the quarter-finals at the Sony Ericsson Open.

SO EASY: Andy Murray produced his most convincing win of 2009 to reach the last eight in Miami (Getty Images)

Despite having less than 24 hours to recover from his win over Nicolas Massu, the British number one totally dominated the Serbian world number 41 in Miami.

Troicki beat Argentina's David Nalbandian earlier in the week but lost his only previous encounter against the number four seed.

Murray won the first five games in quick-fire fashion and closed out the match 6-1, 6-0 as Troicki struggled with all elements of his game, particularly his serve.

"I played well and my tactics were spot on," said Murray.

"It was very hot out here and the conditions were pretty tough, so I'm pleased to get off court as quickly as possible.

"He didn't hit his first serve well and that is his biggest weapon. I got off to a good start and he obviously struggled."

Murray will play eighth seed Fernando Verdasco, who beat him in the quarter-finals of the Australian Open, after his comprehensive 6-2, 6-2 win over big-serving Czech Radek Stepanek. But he'll have 48 hours to recover from this brief appearance

"Fernando is playing really well this year but it won't be a case of revenge for what happened in Australia," he added.

"He's a tough opponent and I need to maintain this form to stand a chance."

ON THE RISE: Britain's Laura Robson is now the world's number one junior girls player (Getty Images)

Meanwhile, Wimbledon girls' champion Laura Robson has taken over as the world's top-ranked junior.

The 15-year-old succeeds Thailand's Noppawan Lertcheewakarn, whom she beat in the final at the All England Club last July. Robson is currently at a career-high WTA Tour senior ranking of 499, making her the British number 13.