Murray, Berdych into semis

World number four Andy Murray booked his semifinal berth at the Miami Masters on Wednesday, rallying for a 3-6, 6-4, 6-1 win over Austrian Dominic Thiem.

The third-seeded former champion will face eighth seed Tomas Berdych after the Czech dispatched Juan Monaco 6-3, 6-4 to extend his perfect record against the Argentine to 7-0.

Murray, who won title at Crandon Park in 2009 and 2013, was initially stunned by the clean and powerful one-handed backhand of the 21-year-old Thiem, who has looked strong in Miami after coming into the tournament with a 3-5 record in 2015.

Thiem, ranked 52nd in the world, now stands 1-7 against top-10 opponents.

But he surprised Murray in the opening set, breaking for 3-1 on his way to winning the first frame.

Two-time Grand Slam champion Murray launched his fight-back with a quick break for a 2-0 lead in the second.

Thiem regained the break to narrow the gap to 4-3, but Murray broke him in the final game of the set -- Thiem saving one set point before putting a backhand wide on another.

His confidence boosted, Murray ran away with the final set, taking his lead to 5-1 with a second break of Thiem before closing out the win with a service winner.

Berdych took 92 minutes to get past Monaco, producing a pair of love service games and a break in the final three games to capture the tight second set and seal the win.

"It was a tough one today, it was very important to get an early lead," said the winner. "He was playing fast and giving me pressure on every ball.