FILE - In this July 3, 2017, file photo, Switzerland's Stan Wawrinka reacts during his men's singles match against Russia's Daniil Medvedev on the opening day at the Wimbledon Tennis Championships, in London. Defending champion Stan Wawrinka has pulled out of the U.S. Open with an injured knee. Wawrinka announced Friday, Aug. 4, 2017, he would sit out the rest of 2017 because of the knee. (AP Photo/Kirsty Wigglesworth, File)
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