Roger Federer of Switzerland takes his towel from a ball boy as he walks back to his chair during a game break as he plays against Milos Raonic of Canada during their men's singles semifinal match at the All England Lawn Tennis Championships in Wimbledon, London, Friday, July 4, 2014. (AP Photo/Pavel Golovkin)

Britain Wimbledon Tennis

Roger Federer of Switzerland takes his towel from a ball boy as he walks back to his chair during a game break as he plays against Milos Raonic of Canada during their men's singles semifinal match at the All England Lawn Tennis Championships in Wimbledon, London, Friday, July 4, 2014. (AP Photo/Pavel Golovkin)

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