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PARIS, FRANCE - NOVEMBER 04: Jack Sock of the United States plays a backhand against John Isner of the United States during 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: Jack Sock of the United States plays a backhand against John Isner of the United States during 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)
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