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NEW YORK, NY - SEPTEMBER 01: Fabio Fognini of Italy returns a shot to David Ferrer of Spain during his second round Men's Singles match on Day Four of the 2016 US Open at the USTA Billie Jean King National Tennis Center on September 1, 2016 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Elsa/Getty Images)

NEW YORK, NY - SEPTEMBER 01:  Fabio Fognini of Italy returns a shot to David Ferrer of Spain during his second round Men's Singles match on Day Four of the 2016 US Open at the USTA Billie Jean King National Tennis Center on September 1, 2016 in the Flushing neighborhood of the Queens borough of New York City.  (Photo by Elsa/Getty Images)