NEW YORK, NY - AUGUST 30:  Kei Nishikori of Japan meets Leonardo Mayer of Argentina after winning their men's singles third round match on Day Six of the 2014 US Open at the USTA Billie Jean King National Tennis Center on August 30, 2014 in the Flushing neighborhood of the Queens borough of New York City.  (Photo by Matthew Stockman/Getty Images)