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FILE - In this July 8, 2016, file photo, Roger Federer of Switzerland receives medical attention during his men's semifinal singles match against Milos Raonic of Canada at the Wimbledon Tennis Championships in London. Federer says he contemplated scenarios in which he would play in the Olympics and skip the U.S. Open, and vice versa. In the end, his balky left knee wouldn't allow him to do either. (AP Photo/Alastair Grant, File)