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LONDON, ENGLAND - NOVEMBER 18: Jack Sock and Mike Bryan of The United States lift the trophy following victory following thier doubles final against Pierre-Hugues Herbert and Nicolas Mahut of France during Day Eight of the Nitto ATP Finals at The O2 Arena on November 18, 2018 in London, England. (Photo by Justin Setterfield/Getty Images)

LONDON, ENGLAND - NOVEMBER 18:  Jack Sock and Mike Bryan of The United States lift the trophy following victory following thier doubles final against Pierre-Hugues Herbert and Nicolas Mahut of France during Day Eight of the Nitto ATP Finals at The O2 Arena on November 18, 2018 in London, England.  (Photo by Justin Setterfield/Getty Images)