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Newly crowned Australian Open champion Novak Djokovic of Serbia kisses the Australian Open tennis trophy along the Yarra river in downtown Melbourne on February 2, 2015 the day after he beat Andy Murray of Britain in the men's singles final. AFP PHOTO / MANAN VATSYAYANA --IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE-- (Photo credit should read MANAN VATSYAYANA/AFP/Getty Images)

Newly crowned Australian Open champion Novak Djokovic of Serbia kisses the Australian Open tennis trophy along the Yarra river in downtown Melbourne on February 2, 2015 the day after he beat Andy Murray of Britain in the men's singles final.  AFP PHOTO / MANAN VATSYAYANA
--IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE--        (Photo credit should read MANAN VATSYAYANA/AFP/Getty Images)