![Roger Federer of Switzerland hits a ball during a practice session prior to the 2015 U.S. Open at the USTA Billie Jean King National Tennis Center in the Flushing neighborhood of the Roger Federer of Switzerland hits a ball during a practice session prior to the 2015 U.S. Open at the USTA Billie Jean King National Tennis Center in the Flushing neighborhood of the](https://c8.alamy.com/comp/2EX9GFT/roger-federer-of-switzerland-hits-a-ball-during-a-practice-session-prior-to-the-2015-us-open-at-the-usta-billie-jean-king-national-tennis-center-in-the-flushing-neighborhood-of-the-queens-borough-of-new-york-ny-on-august-28-2015-photo-by-anthony-behar-please-use-credit-from-credit-field-2EX9GFT.jpg)
Roger Federer of Switzerland hits a ball during a practice session prior to the 2015 U.S. Open at the USTA Billie Jean King National Tennis Center in the Flushing neighborhood of the
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WATCH: Roger Federer puts his hat and whites on for solo drill and tags nearly every famous sporting person - Tennis365
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Swiss tennis player Roger Federer practices during a training session for the 2010 Shanghai Rolex Masters in Shanghai, China, October 11, 2010 Stock Photo - Alamy
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