NEW YORK, NY - SEPTEMBER 08: Novak Djokovic of Serbia returns a shot to Feliciano Lopez of Spain during their Men's Singles Quarterfinals match on Day Nine of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 8, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Clive Brunskill/Getty Images)
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