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NEW YORK, NY - SEPTEMBER 12:  USTA Chairman, CEO and president Katrina Adams (R) presents the winner's trophy to Flavia Pennetta of Italy after she defeated Roberta Vinci of Italy during their Women's Singles Final match 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. Pennetta defeated Vinci 7-6, 6-2.  (Photo by Matthew Stockman/Getty Images)
NEW YORK, NY - SEPTEMBER 12:  USTA Chairman, CEO and president Katrina Adams (R) presents the winner's trophy to Flavia Pennetta of Italy after she defeated Roberta Vinci of Italy during their Women's Singles Final match 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. Pennetta defeated Vinci 7-6, 6-2.  (Photo by Matthew Stockman/Getty Images)

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    Flavia Pennetta's fairytale ending at the U.S. Open

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Flavia Pennetta's fairytale ending at the U.S. Open

Long-time friends Roberta Vinci and Flavia Pennetta had never played in a grand slam final before. Pennetta prevailed in two tight sets - and retired.

Flavia Pennetta's fairytale ending at the U.S. Open

Long-time friends Roberta Vinci and Flavia Pennetta had never played in a grand slam final before. Pennetta prevailed in two tight sets - and retired.