NEW YORK, NY - AUGUST 30:  Jelena Jankovic of Serbia returns a shot to Mariana Duque-Mariño of Colombia during her first round Women's Singles match on Day Two of the 2016 US Open at the USTA Billie Jean King National Tennis Center on August 30, 2016 in the Flushing neighborhood of the Queens borough of New York City.  (Photo by Michael Reaves/Getty Images)