NEW YORK, NY - SEPTEMBER 04: Marin Cilic of Croatia serves to Mikhail Kukushkin of Kazakhstan during their Men's Singles Third Round match on Day Five of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 4, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Clive Brunskill/Getty Images)
