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NEW YORK, NY - SEPTEMBER 12: Italian prime minister Matteo Renzi (C) attends the Women's Singles Final match between Roberta Vinci of Italy and Flavia Pennetta of Italy on Day Thirteen of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 12, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

NEW YORK, NY - SEPTEMBER 12:  Italian prime minister Matteo Renzi (C) attends the Women's Singles Final match between Roberta Vinci of Italy and Flavia Pennetta of Italy on Day Thirteen of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 12, 2015 in the Flushing neighborhood of the Queens borough of New York City.  (Photo by Matthew Stockman/Getty Images)