Rafael Nadal of Spain questions a linesman as he plays against Mikhail Kukushkin of Kazakhstan during their men's singles match on Centre Court at the All England Lawn Tennis Championships in Wimbledon, London, Saturday, June 28, 2014. (AP Photo/Ben Curtis)

Britain Wimbledon Tennis

Rafael Nadal of Spain questions a linesman as he plays against Mikhail Kukushkin of Kazakhstan during their men's singles match on Centre Court at the All England Lawn Tennis Championships in Wimbledon, London, Saturday, June 28, 2014. (AP Photo/Ben Curtis)

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