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Image #: 16119751 (101128) -- LONDON, Nov. 28, 2011 (Xinhua) -- Roger Federer of Switzerland celebrates after winning his final match against Jo-Wilfried Tsonga of France, in 2011's ATP World Tour Finals, in London, Britain, Nov. 27, 2011. Federer won 2-1 to claim the tital for the sixth time. (Xinhua/Tang Shi)