Tennis: World Tour Finals - 2009 - 22/11/2009

Live coverage from the O2 Arena of the opening day of the Barclays ATP World Tour finals, which are taking place in London for the first time. Over the next week, the likes of Roger Federer, Rafael Nadal and Andy Murray will be battling it out for the prestigious title - and the five million pound prize money that is on offer. The world's top eight players are invited to the tournament, which features two round-robin groups followed by semi-finals and the final. In its various guises since its inception in 1970, the event has been won by the game's biggest names, including Bjorn Borg, John McEnroe, Boris Becker, Pete Sampras and Federer himself, who has claimed the title four times. Commentary comes from Andrew Castle and Tim Henman.