(121107) -- LONDON, Nov. 7, 2012 (Xinhua) -- Roger Federer of Switzerland returns a shot during the men's singles Group B tennis match against Janko Tipsarevic of Serbia at the ATP World Tour Finals at the O2 Arena in London, Britain, on Nov. 6, 2012. Roger Federer won 2-0. (Xinhua/Tang Shi)
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