Stan Wawrinka of Switzerland plays a return to Denis Istomin of Uzbekistan during their men's singles match at the All England Lawn Tennis Championships in Wimbledon, London, Monday, June 30, 2014. (AP Photo/Sang Tan)

Britain Wimbledon Tennis

Stan Wawrinka of Switzerland plays a return to Denis Istomin of Uzbekistan during their men's singles match at the All England Lawn Tennis Championships in Wimbledon, London, Monday, June 30, 2014. (AP Photo/Sang Tan)

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