World No.4 Andy Murray booked his semi-final berth at the Miami Open 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.

“I expected a tough match, he’s beaten some very good players this week,” said Murray, who needed one hour and 44 minutes to seal the win.

“He’s a very big hitter of the ball, a very strong guy and he moves extremely well.”

World No.52 Thiem 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 has won six of 11 encounters with Murray, but lost their last meeting, in the Australian Open semi-finals two months ago.