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Serbia's Novak Djokovic holds the winner's trophy after beating Switzerland's Roger Federer in the men's singles final match, during the presentation on day thirteen of the 2015 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 12, 2015. Djokovic won the match 7-6, 6-7, 6-4, 6-3. RESTRICTED TO EDITORIAL USE -- AFP PHOTO / ADRIAN DENNIS (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)

Serbia's Novak Djokovic holds the winner's trophy after beating Switzerland's Roger Federer in the men's singles final match, during the presentation on day thirteen of the 2015 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 12, 2015. Djokovic won the match 7-6, 6-7, 6-4, 6-3.  RESTRICTED TO EDITORIAL USE  --  AFP PHOTO / ADRIAN DENNIS        (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)