LONDON, ENGLAND - NOVEMBER 07: Novak Djokovic of Serbia, Stan Wawrinka of Switzerland, Tomas Berdych of Czech Republic, Marin Cilic of Croatia, Roger Federer of Switzerland, Andy Murray of Great Britain, Kei Nishikori of Japan, Milos Raonic of Canada pose for a photo as they travel along the thames during the Barclays ATP World Tour Finals tennis previews at the O2 Arena on November 7, 2014 in London, England. (Photo by Julian Finney/Getty Images)
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