LONDON, ENGLAND - NOVEMBER 10: Stanislas Wawrinka of Switzerland returns ball to Tomas Berdych of the Czech Republic during the singles group A match tennis match on the second day of the Barclays ATP World Tour Finals at the O2 Arena on November 10, 2014 in London, England. (Photo by Yunus Kaymaz/Anadolu Agency/Getty Images)
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