Novak Djokovic of Serbia changes his shirt during a game 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

Novak Djokovic of Serbia changes his shirt during a game 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)

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