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NEW YORK, NY - SEPTEMBER 09: TV Personality Jimmy Fallon and singer and actor Justin Timberlake dance to 'Single Ladies' during the Men's Singles Quarterfinals match between Richard Gasquet of France and Roger Federer of Switzerland on Day Ten of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 9, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Al Bello/Getty Images)

NEW YORK, NY - SEPTEMBER 09:  TV Personality Jimmy Fallon and singer and actor Justin Timberlake dance to 'Single Ladies'  during the Men's Singles Quarterfinals match between Richard Gasquet of France and Roger Federer of Switzerland on Day Ten of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 9, 2015 in the Flushing neighborhood of the Queens borough of New York City.  (Photo by Al Bello/Getty Images)