DOHA, QATAR - JANUARY 08: Serbian tennis player Novak Djokovic returns the ball to Ivo Karlovic (not seen) of Croatia during their quarter-final tennis match in the Qatar's ExxonMobil Open at the Khalifa International Tennis and Squash Complex in the capital Doha on January 8, 2015. (Photo by Mohamed Farag/Anadolu Agency/Getty Images)
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