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Serbia's Novak Djokovic receives a ball before serving during his men's singles semi-final match against Bulgaria's Grigor Dimitrov on day 11 of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 4, 2014. (GLYN KIRK/AFP/Getty Images) ( 531360368 )

Bulgaria's Grigor Dimitrov (back) hits a ball that passes Serbia's Novak Djokovic at the net during their men's singles semi-final match on day 11 of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 4, 2014. (GLYN KIRK/AFP/Getty Images) ( 531362170 )

Bulgaria's Grigor Dimitrov serves to Serbia's Novak Djokovic during their men's singles semi-final match on day 11 of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 4, 2014. (GLYN KIRK/AFP/Getty Images) ( 531359697 )

Serbia's Novak Djokovic returns to Bulgaria's Grigor Dimitrov during their men's singles semi-final match on day 11 of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 4, 2014. (CARL COURT/AFP/Getty Images) ( 531360230 )

German former champion tennis player Boris Becker, coach of Serbia's Novak Djokovic, watches Djokovic warm up before his men's singles semi-final match against Bulgaria's Grigor Dimitrov on day 11 of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 4, 2014. (GLYN KIRK/AFP/Getty Images) ( 531358793 )

tSerbia's Novak Djokovic serves to Bulgaria's Grigor Dimitrov during their men's singles semi-final match on day 11 of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 4, 2014. (GLYN KIRK/AFP/Getty Images) ( 531358958 )

Serbia's Novak Djokovic returns to Bulgaria's Grigor Dimitrov during their men's singles semi-final match on day 11 of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 4, 2014. (CARL COURT/AFP/Getty Images) ( 531358947 )

Bulgaria's Grigor Dimitrov reacts to hitting the ball out during his men's singles semi-final match against Serbia's Novak Djokovic on day 11 of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 4, 2014. (CARL COURT/AFP/Getty Images) ( 531359595 )

Bulgaria's Grigor Dimitrov jumps to hit a return to Serbia's Novak Djokovic during their men's singles semi-final match on day 11 of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 4, 2014. (CARL COURT/AFP/Getty Images) ( 531360585 )

Bulgaria's Grigor Dimitrov reacts to winning a point against Serbia's Novak Djokovic during their men's singles semi-final match on day 11 of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 4, 2014. (CARL COURT/AFP/Getty Images) ( 531359825 )

Bulgaria's Grigor Dimitrov (front) and Serbia's Novak Djokovic (back) slip and fall down during their men's singles semi-final match on day 11 of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 4, 2014. (GLYN KIRK/AFP/Getty Images) ( 531361024 )

Bulgaria's Grigor Dimitrovreacts to losing a point against Serbia's Novak Djokovic during their men's singles semi-final match on day 11 of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 4, 2014. (CARL COURT/AFP/Getty Images) ( 531362632 )

Serbia's Novak Djokovic celebrates winning his men's singles semi-final match against Bulgaria's Grigor Dimitrov during their on day 11 of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 4, 2014. Djokovic won 6-4, 3-6, 7-6, 7-6. (CARL COURT/AFP/Getty Images) ( 531363105 )

Serbia's Novak Djokovic (L) shakes hands with Bulgaria's Grigor Dimitrov after the former won their men's singles semi-final match on day 11 of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 4, 2014. (CARL COURT/AFP/Getty Images) ( 531363215 )

Novak Djokovic of Serbia covers his head under a towel to cool down during a games break as he plays against Grigor Dimitrov of Bulgaria during their men’s singles semifinal match at the All England Lawn Tennis Championships in Wimbledon, London, Friday, July 4, 2014. (AP Photo/Pavel Golovkin) ( Britain Wimbledon Tennis )

Roger Federer of Switzerland wipes his face with a towel during the men’s singles semifinal match against Milos Raonic of Canada at the All England Lawn Tennis Championships in Wimbledon, London, Friday, July 4, 2014. (AP Photo/Ben Curtis) ( Britain Wimbledon Tennis )

British actor Jude Law sits in the Royal box on Centre Court during the men's singles semi-final match between Switzerland's Roger Federer and Canada's Milos Raonic during their on day 11 of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 4, 2014. (FACUNDO ARRIZABALAGA/AFP/Getty Images) ( 531366044 )

Switzerland's Roger Federer serves to Canada's Milos Raonic during their men's singles semi-final match on day 11 of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 4, 2014. (CARL COURT/AFP/Getty Images) ( 531365471 )

Roger Federer of Switzerland wipes his face during the men's singles semifinal match against Milos Raonic of Canada at the All England Lawn Tennis Championships in Wimbledon, London, Friday, July 4, 2014. (AP Photo/Ben Curtis) ( Britain Wimbledon Tennis )

Milos Raonic of Canada serves to Roger Federer of Switzerland during their men’s singles semifinal match at the All England Lawn Tennis Championships in Wimbledon, London, Friday, July 4, 2014. (AP Photo/Pavel Golovkin) ( Britain Wimbledon Tennis )

Switzerland's Roger Federer returns to Canada's Milos Raonic during their men's singles semi-final match on day 11 of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 4, 2014. (CARL COURT/AFP/Getty Images) ( 531364627 )

Milos Raonic of Canada plays a return to Roger Federer of Switzerland during their men’s singles semifinal match at the All England Lawn Tennis Championships at Wimbledon, London, Friday, July, 4, 2014. (AP Photo/Facundo Arrizabalaga, Pool) ( Britain Wimbledon Tennis )

Canada's Milos Raonic (back) falls down as Switzerland's Roger Federer returns a shot during their men's singles semi-final match on day 11 of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 4, 2014. (GLYN KIRK/AFP/Getty Images) ( 531366313 )

Milos Raonic of Canada advances to the net to play a return to Roger Federer of Switzerland during their men’s singles semifinal match at the All England Lawn Tennis Championships at Wimbledon, London, Friday, July, 4, 2014. (AP Photo/John Walton, Pool) ( Britain Wimbledon Tennis )

Milos Raonic of Canada sits in his chair and wipes his face during a game break as he plays against Roger Federer of Switzerland during their men’s singles semifinal match at the All England Lawn Tennis Championships in Wimbledon, London, Friday, July 4, 2014. (AP Photo/Pavel Golovkin) ( Britain Wimbledon Tennis )

Roger Federer of Switzerland celebrates a point against Milos Raonic of Canada during their men's singles semifinal match at the All England Lawn Tennis Championships in Wimbledon, London, Friday, July 4, 2014. (AP Photo/Ben Curtis) ( Britain Wimbledon Tennis )

Canada's Milos Raonic eyes the ball during his men's singles semi-final match against Switzerland's Roger Federer on day 11 of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 4, 2014. (GLYN KIRK/AFP/Getty Images) ( 531365606 )

US actor Bradley Cooper and his girlfriend British model Suki Waterhouse sit in the Royal box on Centre Court as they watch the men's singles semi-final match between Switzerland's Roger Federer and Canada's Milos Raonic during their on day 11 of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 4, 2014. (FACUNDO ARRIZABALAGA/AFP/Getty Images) ( 531366141 )

Switzerland's Roger Federer celebrates winning his men's singles semi-final match against Canada's Milos Raonic on day 11 of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 4, 2014. Federer won 6-4, 6-4, 6-4. (CARL COURT/AFP/Getty Images) ( 531367365 )

Canada's Milos Raonic returns to Switzerland's Roger Federer during their men's singles semi-final match on day 11 of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 4, 2014. (CARL COURT/AFP/Getty Images) ( 531367117 )

Canada's Milos Raonic reacts during his men's singles semi-final match against Switzerland's Roger Federer on day 11 of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 4, 2014. (CARL COURT/AFP/Getty Images) ( 531367189 )

Switzerland's Roger Federer leaves Central Court after winning his men's singles semi-final match against Canada's Milos Raonic on day 11 of the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 4, 2014. Federer won 6-4, 6-4, 6-4. (CARL COURT/AFP/Getty Images) ( 531367468 )