Kei Nishikori of Japan uses eye drops during a game break as he plays against Milos Raonic of Canada during their men's singles match at the All England Lawn Tennis Championships in Wimbledon, London, Tuesday, July 1, 2014. (AP Photo/Sang Tan)

Britain Wimbledon Tennis

Kei Nishikori of Japan uses eye drops during a game break as he plays against Milos Raonic of Canada during their men's singles match at the All England Lawn Tennis Championships in Wimbledon, London, Tuesday, July 1, 2014. (AP Photo/Sang Tan)

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