Swiss tennis star Roger Federer will face Andy Murray, Robin Söderling and David Ferrer in the first round of the ATP World Tour Finals, which begin on Sunday.
Federer will be looking to win the end-of-year tournament, disputed by the top eight male players in the world rankings, for the fifth time.
The other group comprises Rafael Nadal, Novak Djokovic, Tomas Berdych and Andy Roddick.
Unlike most other events on the men's tour, the World Tour Finals is not a straightforward knock-out tournament. Eight players are divided into two groups of four and play three round-robin matches each against the other three players in their group. From there, the two players with the best records in each group progress to the semifinals, with the winners meeting in the final.
Neither of last year’s finalists will be playing at the 17,500-seater O2 Arena in London. Defending champion Nikolay Davydenko has fallen to 22 in the world, and Juan Martin del Potro has been off injured since the beginning of the year.
World number two Federer won the tournament in 2003, 2004, 2006 and 2007.
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