Top tennis stars set for ATP World Tour Finals

Eight of the world's best players are set to compete in London once again this year, this time at the ATP World Tour Finals.

World number four Rafael Nadal is out through injury, making way for Janko Tipsarevic, and defending champion Roger Federer hopes his experience will count.

Andy Murray will play Czech Tomas Berdych in his opening match and is joined in Group A by Novak Djokovic and Jo-Wilfried Tsonga, while Roger Federer, David Ferrer, Juan Martin del Potro and Tipsarevic have been drawn in Group B.