The field for the end-of-season Barclays ATP World Tour Finals, starting at London's O2 Arena ton Sunday, contains only one debutant - 25-year-old Tomas Berdych.
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Tennis players (front row L-R) Andy Roddick, Tomas Berdych, Novak Djokovic, Rafael Nadal, Roger Federer, Robin Soderling, Andy Murray and David Ferrer pose for a group picture in front of the Houses of Parliament in London, November 19, 2010. The world's highest ranking tennis players are in London to compete in the ATP World Tour Finals which begin in two days. Behind the singles players, are players competing in the doubles competition.