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NEW YORK, NY - SEPTEMBER 01: A general view of Arthur Ashe Stadium with the roof closed during the second round Men's Singles match between Andy Murray of Great Britain and Marcel Granollers of Spain on Day Four of the 2016 US Open at the USTA Billie Jean King National Tennis Center on September 1, 2016 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Mike Hewitt/Getty Images)

NEW YORK, NY - SEPTEMBER 01:  A general view of Arthur Ashe Stadium with the roof closed during the second round Men's Singles match between Andy Murray of Great Britain and Marcel Granollers of Spain on Day Four of the 2016 US Open at the USTA Billie Jean King National Tennis Center on September 1, 2016 in the Flushing neighborhood of the Queens borough of New York City.  (Photo by Mike Hewitt/Getty Images)