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Serbia's Novak Djokovic celebrates winning his men's singles final match against Switzerland's Roger Federer on day thirteen of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 6, 2014. CARL COURT/AFP/Getty Images ( 531415530 )

Serbia's Novak Djokovic reaches out for the ball before falling down during his men's singles final match against Switzerland's Roger Federer on day thirteen of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 6, 2014. CARL COURT/AFP/Getty Images ( 531417833 )

Roger Federer of Switzerland leaps in an attempt to play a return to Novak Djokovic of Serbia during their men's singles final match at the All England Lawn Tennis Championships in Wimbledon, London, Sunday, July 6, 2014. (AP Photo/Sang Tan, Pool) ( APTOPIX Britain Wimbledon Tennis )

Serbia's Novak Djokovic serves to Switzerland's Roger Federer during their men's singles final match on day thirteen of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 6, 2014. CARL COURT/AFP/Getty Images ( 531412074 )

Britain's Prince William, the Duke of Cambridge, and his wife Catherine, the Duchess of Cambridge, sit in the Royal Box on Centre Court before the start of the men's singles final match between Serbia's Novak Djokovic and Switzerland's Roger Federer on day thirteen of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 6, 2014. CARL COURT/AFP/Getty Images ( 531410404 )

Roger Federer of Switzerland stretches full length to play a return to Novak Djokovic of Serbia during the men's singles final at the All England Lawn Tennis Championships at Wimbledon, London, Sunday, July, 6, 2014. (AP Photo/Toby Melville, Pool) ( APTOPIX Britain Wimbledon Tennis )

Roger Federer of Switzerland wipes his face with his wrist band as he plays against Novak Djokovic of Serbia during their men's singles final match at the All England Lawn Tennis Championships in Wimbledon, London, Sunday, July 6, 2014. (AP Photo/Pavel Golovkin) ( Britain Wimbledon Tennis )

Serbia's Novak Djokovic plays a return to Switzerland's Roger Federer during their men's singles final match at the All England Lawn Tennis Championships in Wimbledon, London, Sunday, July 6, 2014. (AP Photo/Sang Tan, Pool) ( Britain Wimbledon Tennis )

Roger Federer of Switzerland plays a forehand return during the Gentlemen's Singles Final match against Novak Djokovic of Serbia on day thirteen of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 6, 2014 in London, England. (Photo by Al Bello/Getty Images) ( 451766236 )

Hugh Jackman in the Royal Box on Centre Court before the Gentlemen's Singles Final match between Roger Federer of Switzerland and Novak Djokovic of Serbia on day thirteen of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 6, 2014 in London, England. (Photo by Matthew Stockman/Getty Images) ( 451759294 )

Novak Djokovic of Serbia plays a return to Roger Federer of Switzerland during their men's singles final at the All England Lawn Tennis Championships in Wimbledon, London, Sunday July 6, 2014. (AP Photo/Ben Curtis) ( Britain Wimbledon Tennis )

Roger Federer of Switzerland celebrates during the Gentlemen's Singles Final match against Novak Djokovic of Serbia on day thirteen of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 6, 2014 in London, England. (Photo by Matthew Stockman/Getty Images) ( 451765100 )

Novak Djokovic of Serbia watches the ball hit his racquet as he plays a return to Roger Federer of Switzerland during their men's singles final match at the All England Lawn Tennis Championships in Wimbledon, London, Sunday, July 6, 2014. (AP Photo/Sang Tan, Pool) ( Britain Wimbledon Tennis )

Former English footballer David Beckham and his wife Victoria sit in the Royal Box on Centre Court before the start of the men's singles final match between Serbia's Novak Djokovic and Switzerland's Roger Federer on day thirteen of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 6, 2014. CARL COURT/AFP/Getty Images ( 531410520 )

Roger Federer of Switzerland serves to Novak Djokovic of Serbia during their men's singles final match at the All England Lawn Tennis Championships in Wimbledon, London, Sunday, July 6, 2014. (AP Photo/Pavel Golovkin) ( Britain Wimbledon Tennis )

Roger Federer of Switzerland celebrates during the Gentlemen's Singles Final match against Novak Djokovic of Serbia on day thirteen of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 6, 2014 in London, England. (Photo by Pool/Getty Images) ( 451766002 )

Novak Djokovic of Serbia dives to make a return as Roger Federer of Switzerland stands at the net during the Gentlemen's Singles Final match on day thirteen of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 6, 2014 in London, England. (Photo by Al Bello/Getty Images) ( 451769582 )

Serbia's Novak Djokovic falls down during his men's singles final match against Switzerland's Roger Federer on day thirteen of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 6, 2014. TOBY MELVILLE/AFP/Getty Images ( 531414536 )

Fans of Roger Federer of Switzerland on Murray mound show their support as they watch his Gentlemen's Singles Final match against Novak Djokovic of Serbia on day thirteen of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 6, 2014 in London, England. (Photo by Jan Kruger/Getty Images) ( 451764382 )

Switzerland's Roger Federer returns to Serbia's Novak Djokovic during their men's singles final match on day thirteen of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 6, 2014. CARL COURT/AFP/Getty Images ( 531412092 )

Serbia's Novak Djokovic gestures during his men's singles final match against Switzerland's Roger Federer on day thirteen of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 6, 2014. GLYN KIRK/AFP/Getty Images ( 531413363 )

General view of centre court as Novak Djokovic of Serbia makes a return during the Gentlemen's Singles Final match against Roger Federer of Switzerland on day thirteen of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 6, 2014 in London, England. (Photo by Clive Brunskill/Getty Images) ( 451766212 )

Switzerland's Roger Federer returns to Serbia's Novak Djokovic during their men's singles final match on day thirteen of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 6, 2014. TOBY MELVILLE/AFP/Getty Images ( 531414684 )

US actor Samuel L Jackson sits in the Royal Box on Centre Court before the start of the men's singles final match between Serbia's Novak Djokovic and Switzerland's Roger Federer on day thirteen of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 6, 2014. CARL COURT/AFP/Getty Images ( 531410478 )

Novak Djokovic of Serbia plays a return to Roger Federer of Switzerland during their men's singles final match at the All England Lawn Tennis Championships in Wimbledon, London, Sunday, July 6, 2014. (AP Photo/Pavel Golovkin) ( Britain Wimbledon Tennis )

Serbia's Novak Djokovic returns to Switzerland's Roger Federer during their men's singles final match on day thirteen of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 6, 2014. GLYN KIRK/AFP/Getty Images ( 531413371 )

Roger Federer of Switzerland plays a return to Novak Djokovic of Serbia during their men's singles final match at the All England Lawn Tennis Championships in Wimbledon, London, Sunday, July 6, 2014. (AP Photo/Ben Curtis) ( Britain Wimbledon Tennis )

Novak Djokovic of Serbia falls to the ground and celebrates defeating Roger Federer of Switzerland in the men's singles final at the All England Lawn Tennis Championships in Wimbledon, London, Sunday July 6, 2014. (AP Photo/Pavel Golovkin) ( Britain Wimbledon Tennis )

Novak Djokovic of Serbia celebrates defeating Roger Federer of Switzerland in the men's singles final at the All England Lawn Tennis Championships in Wimbledon, London, Sunday July 6, 2014. (AP Photo/Ben Curtis) ( Britain Wimbledon Tennis )

Serbia's Novak Djokovic eats the grass as he celebrates winning his men's singles final match against Switzerland's Roger Federer on day thirteen of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 6, 2014. CARL COURT/AFP/Getty Images ( 531415511 )

Serbia's Novak Djokovic (R) shakes hands with Switzerland's Roger Federer after the former won their men's singles final match on day thirteen of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 6, 2014. Djokovic won his second Wimbledon title and seventh career major with a 6-7 (7/9), 6-4, 7-6 (7/4), 5-7, 6-4 victory over Roger Federer Sunday, shattering the Swiss star's dream of a record eighth triumph in a titanic struggle. CARL COURT/AFP/Getty Images ( 531417055 )

Serbia's Novak Djokovic (R) hugs Switzerland's Roger Federer after the former won their men's singles final match on day thirteen of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 6, 2014. Djokovic won his second Wimbledon title and seventh career major with a 6-7 (7/9), 6-4, 7-6 (7/4), 5-7, 6-4 victory over Roger Federer Sunday, shattering the Swiss star's dream of a record eighth triumph in a titanic struggle. CARL COURT/AFP/Getty Images ( 531417097 )