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Serbia's player Novak Djokovic celebrates after winning against Czech Republic's Tomas Berdych in the Monte-Carlo ATP Masters Series Tournament final tennis match, on April 19, 2015 in Monaco. Djokovic won 7-5, 4-6, 6-3. AFP PHOTO / JEAN-CHRISTOPHE MAGNENET (Photo credit should read JEAN-CHRISTOPHE MAGNENET/AFP/Getty Images)

Serbia's player Novak Djokovic celebrates after winning against Czech Republic's Tomas Berdych in the Monte-Carlo ATP Masters Series Tournament final tennis match, on April 19, 2015 in Monaco. Djokovic won 7-5, 4-6, 6-3. AFP PHOTO / JEAN-CHRISTOPHE MAGNENET        (Photo credit should read JEAN-CHRISTOPHE MAGNENET/AFP/Getty Images)