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LONDON, ENGLAND - JUNE 24: Jack Sock of the United States in action during his Gentlemen's Singles first round match against Pierre-Hugues Herbert of France on day two of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club at Wimbledon on June 24, 2014 in London, England. (Photo by Steve Bardens/Getty Images)

LONDON, ENGLAND - JUNE 24:  Jack Sock of the United States in action during his Gentlemen's Singles first round match against Pierre-Hugues Herbert of France on day two of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club at Wimbledon on June 24, 2014 in London, England.  (Photo by Steve Bardens/Getty Images)