2015 U.S. Open - Day 12
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 on Sept. 11, 2015.Clive Brunskill—Getty Images
2015 U.S. Open - Day 12
2015 US Open
2015 U.S. Open - Day 6
2015 U.S. Open - Day 6
Tennis - 2015 US Open - Day Four - Billie Jean King National Tennis Center
Camila Giorgi, of Italy, returns a shot to Sabine Lisicki, of Germany, during the second round of the U.S. Open tennis tournament, Thursday, Sept. 3, 2015, in New York. (AP Photo/Adam Hunger)
Tomas BerdTomas Berdych, of the Czech Republic, reacts after defeating Jurgen Melzer, of Austria, in the second round of the U.S. Open Tennis tournament in New York, Thursday, Sept. 3, 2015. (AP Photo/Kathy Willens)ych
Nicole Gibbs, of the United States, prepares to serve to Petra Kvitova, of the Czech Republic, during the second round of the U.S. Open tennis tournament, in New York, on Sept. 3, 2015.
2015 US Open Celebrity Sightings - Day 1
NEW YORK, NY - SEPTEMBER 01: Alexander Zverev of Germany returns a shot against Philipp Kohlschreiber of Germany during their Men's Singles First Round match on Day Two of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 1, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Alex Goodlett/Getty Images)NEW YORK, NY - SEPTEMBER 01: Alexander Zverev of Germany returns a shot against Philipp Kohlschreiber of Germany during their Men's Singles First Round match on Day Two of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 1, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Alex Goodlett/Getty Images)
Rafael Nadal of Spain reacts after defeating Diego Schwartzman of Argentina during their Men's Singles Second Round match on Day Three of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 2, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Clive Brunskill/Getty Images)
NEW YORK, NY - SEPTEMBER 02: Venus Williams of the USA celebrates her match win over Irina Falconi of the USA on Day Three of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 2, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Elsa/Getty Images)
NEW YORK, NY - SEPTEMBER 03: Sabine Lisicki of Germany returns a shot against Camila Giorgi of Italy during their Women's Singles Second Round match on Day Four of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Al Bello/Getty Images)
Roger Federer of Switzerland hits a return to Steve Darcis of Belgium during the 2015 US Open men's singles round two match at the USTA Billie Jean King National Tennis Center September 3, 2015 in New York. AFP PHOTO / DON EMMERT (Photo credit should read DON EMMERT/AFP/Getty Images)
NEW YORK, NY - SEPTEMBER 03: Caroline Wozniacki of Denmark reacts against Petra Cetkovska of the Czech Republic during their Women's Singles Second Round match on Day Four of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Al Bello/Getty Images)
Serena Williams of the United States returns a shot to Roberta Vinci of Italy during their Women's Singles Semifinals ma
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