NEW YORK, NY - SEPTEMBER 04:  (L-R) Rafael Nadal of Spain reacts shakes hands with Fabio Fognini of Italy after their 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 Streeter Lecka/Getty Images)