Former golfer Jack Nicklaus, rear left, and former tennis player Rod Laver, rear right, sit in the Royal Box on centre court prior to the men's singles semifinal match between Novak Djokovic of Serbia and 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

Former golfer Jack Nicklaus, rear left, and former tennis player Rod Laver, rear right, sit in the Royal Box on centre court prior to the men's singles semifinal match between Novak Djokovic of Serbia and 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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