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Swiss Roger Federer celebrates his victory over Spaniard Rafael Nadal in the final match of the Barclays ATP World Tour Finals in the O2 Arena, in London, Britain, 28 November 2010. The Barclays ATP World Tour Finals is a tennis tournament played at the end of each year, involving the top eight players in the men's tennis world rankings.The Barclays ATP World Tour finals takes place in London from the 21th to the 28th November 2010. .