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PARIS, FRANCE - NOVEMBER 04: John Isner of the United States (L) talks with Jack Sock of the United States following the Mens Singles quarter final match on day five of the BNP Paribas Masters at Palais Omnisports de Bercy on November 4, 2016 in Paris, France. (Photo by Dan Mullan/Getty Images)

PARIS, FRANCE - NOVEMBER 04:  John Isner of the United States (L) talks with Jack Sock of the United States following the Mens Singles quarter final match on day five of the BNP Paribas Masters at Palais Omnisports de Bercy on November 4, 2016 in Paris, France. (Photo by Dan Mullan/Getty Images)