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Open Image ModalSerena Williams serves to Roberta Vinci, of Italy, during a semifinal match at the U.S. Open tennis tournament, Friday, Sept. 11, 2015, in New York. (AP Photo/Seth Wenig) (credit:ASSOCIATED PRESS)
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Open Image ModalSerena Williams returns a shot at the net to Roberta Vinci, of Italy, during a semifinal match at the U.S. Open tennis tournament, Friday, Sept. 11, 2015, in New York. (AP Photo/Bill Kostroun) (credit:ASSOCIATED PRESS)
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Open Image ModalNEW YORK, NY - SEPTEMBER 11: Roberta Vinci of Italy serves to Serena Williams of the United States during their Women's Singles Semifinals match on Day Twelve of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 11, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Alex Goodlett/Getty Images) (credit:Alex Goodlett via Getty Images)
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Open Image ModalNEW YORK, NY - SEPTEMBER 11: Serena Williams of the United States serves to Roberta Vinci of Italy during their Women's Singles Semifinals match on Day Twelve of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 11, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Clive Brunskill/Getty Images) (credit:Clive Brunskill via Getty Images)
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Open Image ModalNEW YORK, NY - SEPTEMBER 11: Roberta Vinci of Italy celebrates after winning her second set against Serena Williams of the United States during their Women's Singles Semifinals match on Day Twelve of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 11, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Alex Goodlett/Getty Images) (credit:Alex Goodlett via Getty Images)
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Open Image ModalSerena Williams returns a shot to Roberta Vinci, of Italy, during a semifinal match at the U.S. Open tennis tournament, Friday, Sept. 11, 2015, in New York. (AP Photo/Bill Kostroun) (credit:ASSOCIATED PRESS)
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Open Image ModalNEW YORK, NY - SEPTEMBER 11: Roberta Vinci of Italy reacts against Serena Williams of the United States during their Women's Singles Semifinals match on Day Twelve of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 11, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Alex Goodlett/Getty Images) (credit:Alex Goodlett via Getty Images)
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Open Image ModalNEW YORK, NY - SEPTEMBER 11: Serena Williams of the United States returns a shot to Roberta Vinci of Italy during their Women's Singles Semifinals match on Day Twelve of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 11, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Alex Goodlett/Getty Images) (credit:Alex Goodlett via Getty Images)
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Open Image ModalRoberta Vinci, of Italy, reacts after winning a set against Serena Williams during a semifinal match at the U.S. Open tennis tournament, Friday, Sept. 11, 2015, in New York. (AP Photo/Julio Cortez) (credit:ASSOCIATED PRESS)
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Open Image ModalNEW YORK, NY - SEPTEMBER 11: Serena Williams of the United States reacts against Roberta Vinci of Italy during their Women's Singles Semifinals match on Day Twelve of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 11, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Alex Goodlett/Getty Images) (credit:Alex Goodlett via Getty Images)
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Open Image ModalSerena Williams of the US returns the ball to Roberta Vinci of Italy during their 2015 US Open Women's singles semifinals match at the USTA Billie Jean King National Tennis Center in New York on September 11, 2015. AFP PHOTO/JEWEL SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images) (credit:JEWEL SAMAD via Getty Images)
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Open Image ModalSerena Williams slows her momentum after missing a drop shot at the net from Roberta Vinci, of Italy, during a semifinal match at the U.S. Open tennis tournament, Friday, Sept. 11, 2015, in New York. (AP Photo/Bill Kostroun) (credit:ASSOCIATED PRESS)
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Open Image ModalNEW YORK, NY - SEPTEMBER 11: Roberta Vinci of Italy celebrates after defeating Serena Williams of the United States in their Women's Singles Semifinals match on Day Twelve of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 11, 2015 in the Flushing neighborhood of the Queens borough of New York City. Vinci defeated Williams 2-6, 6-4, 6-4. (Photo by Alex Goodlett/Getty Images) (credit:Alex Goodlett via Getty Images)
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Open Image ModalSerena Williams reacts after losing a point to Roberta Vinci, of Italy, during a semifinal match at the U.S. Open tennis tournament, Friday, Sept. 11, 2015, in New York. (AP Photo/Seth Wenig) (credit:ASSOCIATED PRESS)
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Open Image ModalRoberta Vinci, of Italy, serves to Serena Williams during a semifinal match at the U.S. Open tennis tournament, Friday, Sept. 11, 2015, in New York. (AP Photo/David Goldman) (credit:ASSOCIATED PRESS)
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Open Image ModalRoberta Vinci, of Italy, returns a shot to Serena Williams during a semifinal match at the U.S. Open tennis tournament, Friday, Sept. 11, 2015, in New York. (AP Photo/Julio Cortez) (credit:ASSOCIATED PRESS)
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Open Image ModalSerena Williams serves to Roberta Vinci, of Italy, during a semifinal match at the U.S. Open tennis tournament, Friday, Sept. 11, 2015, in New York. (AP Photo/Julio Cortez) (credit:ASSOCIATED PRESS)
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Open Image ModalSerena Williams of the US returns the ball to Roberta Vinci of Italy during their 2015 US Open Women's singles semifinals match at the USTA Billie Jean King National Tennis Center in New York on September 11, 2015. AFP PHOTO/JEWEL SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images) (credit:JEWEL SAMAD via Getty Images)
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Open Image ModalNEW YORK, NY - SEPTEMBER 11: Roberta Vinci of Italy serves to Serena Williams of the United States during their Women's Singles Semifinals match on Day Twelve of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 11, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Alex Goodlett/Getty Images) (credit:Alex Goodlett via Getty Images)
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Open Image ModalNEW YORK, NY - SEPTEMBER 11: Serena Williams of the United States reacts against Roberta Vinci of Italy during their Women's Singles Semifinals match on Day Twelve of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 11, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Alex Goodlett/Getty Images) (credit:Alex Goodlett via Getty Images)
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Open Image ModalNEW YORK, NY - SEPTEMBER 11: Serena Williams of the United States returns a shot to Roberta Vinci of Italy during their Women's Singles Semifinals match on Day Twelve of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 11, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Clive Brunskill/Getty Images) (credit:Clive Brunskill via Getty Images)
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Open Image ModalSerena Williams serves to Roberta Vinci, of Italy, during a semifinal match at the U.S. Open tennis tournament, Friday, Sept. 11, 2015, in New York. (AP Photo/David Goldman) (credit:ASSOCIATED PRESS)
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Open Image ModalRoberta Vinci, of Italy, reacts after winning a point against Serena Williams during a semifinal match at the U.S. Open tennis tournament, Friday, Sept. 11, 2015, in New York. (AP Photo/David Goldman) (credit:ASSOCIATED PRESS)
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Open Image ModalNEW YORK, NY - SEPTEMBER 11: Serena Williams of the United States returns a shot to Roberta Vinci of Italy during their Women's Singles Semifinals match on Day Twelve of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 11, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Clive Brunskill/Getty Images) (credit:Clive Brunskill via Getty Images)
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Open Image ModalSerena Williams returns a shot to Roberta Vinci, of Italy, during a semifinal match at the U.S. Open tennis tournament, Friday, Sept. 11, 2015, in New York. (AP Photo/Seth Wenig) (credit:ASSOCIATED PRESS)
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Open Image ModalSerena Williams returns a shot to Roberta Vinci, of Italy, during a semifinal match at the U.S. Open tennis tournament, Friday, Sept. 11, 2015, in New York. (AP Photo/Seth Wenig) (credit:ASSOCIATED PRESS)
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Open Image ModalRoberta Vinci of Italy celebrates winning a point against Serena Williams of the US during their 2015 US Open Women's singles semifinals match at the USTA Billie Jean King National Tennis Center in New York on September 11, 2015. Vinci won 2-6, 6-4, 6-4. AFP PHOTO/JEWEL SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images) (credit:JEWEL SAMAD via Getty Images)
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Open Image ModalRoberta Vinci of Italy returns the ball to Serena Williams of the US during their 2015 US Open Women's singles semifinals match at the USTA Billie Jean King National Tennis Center in New York on September 11, 2015. Vinci won 2-6, 6-4, 6-4. AFP PHOTO/JEWEL SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images) (credit:JEWEL SAMAD via Getty Images)
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Open Image ModalRoberta Vinci, of Italy, reacts after beating Serena Williams in a semifinal match at the U.S. Open tennis tournament, Friday, Sept. 11, 2015, in New York. (AP Photo/David Goldman) (credit:ASSOCIATED PRESS)
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Open Image ModalRoberta Vinci of Italy hits a return to Serena Williams of the US during their US Open 2015 women's singles semifinals match at the USTA Billie Jean King National Center September 11, 2015 in New York. AFP PHOTO/TIMOTHY A. CLARY (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images) (credit:TIMOTHY A. CLARY via Getty Images)
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Open Image ModalRoberta Vinci of Italy celebrates defeating Serena Williams of the US during their 2015 US Open Women's singles semifinals match at the USTA Billie Jean King National Tennis Center in New York on September 11, 2015. Vinci won 2-6, 6-4, 6-4. AFP PHOTO/JEWEL SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images) (credit:JEWEL SAMAD via Getty Images)
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Open Image ModalNEW YORK, NY - SEPTEMBER 11: Roberta Vinci of Italy celebrates after defeating Serena Williams of the United States in their Women's Singles Semifinals match on Day Twelve of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 11, 2015 in the Flushing neighborhood of the Queens borough of New York City. Vinci defeated Williams 2-6, 6-4, 6-4. (Photo by Clive Brunskill/Getty Images) (credit:Clive Brunskill via Getty Images)