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NEW YORK, NY - SEPTEMBER 11: USTA President Katrina Adams stands with Men's Singles Champion Stan Wawrinka of Switzerland (R) and second place Novak Djokovic of Serbia (L) after their Men's Singles Final Match on Day Fourteen of the 2016 US Open at the USTA Billie Jean King National Tennis Center on September 11, 2016 in the Queens borough of New York City. Wawrinka won 6-7, 6-4, 7-5, 6-3. (Photo by Chris Trotman/Getty Images for USTA)

NEW YORK, NY - SEPTEMBER 11: USTA President Katrina Adams stands with Men's Singles Champion Stan Wawrinka of Switzerland (R) and second place Novak Djokovic of Serbia (L) after their Men's Singles Final Match on Day Fourteen of the 2016 US Open at the USTA Billie Jean King National Tennis Center on September 11, 2016 in the Queens borough of New York City.  Wawrinka won 6-7, 6-4, 7-5, 6-3.  (Photo by Chris Trotman/Getty Images for USTA)