Tennis TV on Twitter: "A behind-the-back half-volley winner? Not a problem for @GrigorDimitrov 🔥 #FlashbackFriday https://t.co/7F0pl9wkww" / Twitter
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Roger Federer of Switzerland hits an overhead smash to Sergiy Stakhovsky of Ukraine in their men's singles tennis match at the Wimbledon Tennis Championships, in London June 26, 2013. REUTERS/Toby Melville (BRITAIN -