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PARIS, FRANCE - NOVEMBER 05: Jack Sock of the USA celebrates with the trophy after victory against Filip Krajinovic of Serbia in the Mens Final on day 7 of the Rolex Paris Masters held at the AccorHotels Arena on November 5, 2017 in Paris, France. (Photo by Dean Mouhtaropoulos/Getty Images)

PARIS, FRANCE - NOVEMBER 05:  Jack Sock of the USA celebrates with the trophy after victory against Filip Krajinovic of Serbia in the Mens Final on day 7 of the Rolex Paris Masters held at the AccorHotels Arena on November 5, 2017 in Paris, France.  (Photo by Dean Mouhtaropoulos/Getty Images)