World No. 1 Serbian star Novak Djokovic and No. 3 seed Andy Murray of Great Britain booked spots in Sunday's semifinals at the season-ending ATP World Tour Finals.

The 2008 champion Djokovic went 3-0 in his round-robin matches in London after handling fifth-seeded Czech Tomas Berdych 6-2, 7-6 (8-6), while Friday's nightcap saw the U.S. Open and Olympic titlist Murray (2-1) douse seventh- seeded Frenchman Jo-Wilfried Tsonga 6-2, 7-6 (7-3) at The O2 Arena.

Tsonga, who went 0-3 this week, was last year's Tour Finals runner-up to the great Roger Federer, who is also a member of this week's final four.

Djokovic bested Berdych in 1 hour, 37 minutes with the help of seven aces and was broken only once on Day 5, as the former Wimbledon runner-up Berdych went 1-2 this week and, like Tsonga, failed to qualify for the semis. Djokovic saved three set points in the second stanza on Friday.

"It was quite a close set," Berdych said. "I had some chances in the tiebreak. It wasn't one of my best matches with him."

The two-time year-end No. 1 Djokovic has now won his last nine matches against Berdych and is a lopsided 11-1 lifetime against the powerful Czech.

The heavy crowd favorite Murray, still seeking a trip into his first-ever Tour Finals title match, got past Tsonga in 1 hour, 36 minutes by breaking the Frenchman three times, compared to only one break for the loser.

Tsonga went a dismal 1-15 against fellow Top-10 players this year.

Round-robin play will wrap up on Saturday when the second-seeded former No. 1 and reigning Wimbledon champion Federer (2-0) takes on sixth seed Juan Martin del Potro (1-1) and fourth-seeded David Ferrer (1-1) battles eighth seed Janko Tipsarevic (0-2). Ferrer was last week's titlist at the Paris Masters. Del Potro was the Tour Finals runner-up in London in 2009 and upset Federer in a final last month in Basel -- Federer's hometown.

The 31-year-old 17-time Grand Slam champion Federer is a record six-time Tour Finals champ, including wins in the last two finals at this prestigious eight-player event.

This week's four-player Group A featured the group winner and Australian Open champion Djokovic, Murray, Berdych and Tsonga, while Group B boasts Federer, Ferrer, del Potro and Tipsarevic. The top-two players from each group will appear in the semifinals on Sunday and the winners will square off in the lucrative finale Monday night in London.

The 2012 World Tour Finals champion can earn as much as $1.76 million.