Novak Djokovic of Serbia looks round the court as he plays against Jo-Wilfried Tsonga of France during their men's singles match at the All England Lawn Tennis Championships in Wimbledon, London, Monday, June 30, 2014. (AP Photo/Pavel Golovkin)

APTOPIX Britain Wimbledon Tennis

Novak Djokovic of Serbia looks round the court as he plays against Jo-Wilfried Tsonga of France during their men's singles match at the All England Lawn Tennis Championships in Wimbledon, London, Monday, June 30, 2014. (AP Photo/Pavel Golovkin)

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