Novak Djokovic of Serbia puts his hands on his head during the men's singles semifinal match against  Grigor Dimitrov of Bulgaria at the All England Lawn Tennis Championships in Wimbledon, London, Friday, July 4, 2014. (AP Photo/Pavel Golovkin)

Britain Wimbledon Tennis

Novak Djokovic of Serbia puts his hands on his head during the men's singles semifinal match against Grigor Dimitrov of Bulgaria at the All England Lawn Tennis Championships in Wimbledon, London, Friday, July 4, 2014. (AP Photo/Pavel Golovkin)

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