NEW YORK, NY - AUGUST 29: Dominic Thiem of Austria returns a shot against Ernests Gulbis of Latvia during their men's singles second round match on Day Five of the 2014 US Open at the USTA Billie Jean King National Tennis Center on August 29, 2014 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Streeter Lecka/Getty Images)
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