A special, rare talent in a tennis player is the ability to produce your best tennis when it's least expected. Jack Sock has consistently shown this unique skill throughout his career.At the 2010 US Open junior boys event, Sock was a wildcard entrant but managed to stun the junior tennis world by winning the event over Dennis Kudla in the final. (By the way, the now highly-touted Dominic Thiem was the #14 seed in that same event, but was trounced in the first round by Japan's Taro Daniel 64 60.

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