2015 US Open Tennis Championships (180 images)

Novak Djokovic of Serbia reacts as he wins the fifth game of the fourth set against Roger Federer of Switzerland in the Men's Final in Arthur Ashe Stadium at the US Open Tennis Championships at the USTA Billie Jean King National Tennis Center in New York City on September 13, 2015. Photo by Ray Stubblebine/UPI

Roger Federer of Switzerland watches Novak Djokovic of Serbia celebrate after he was defeated 6-4, 5-7, 6-4, 6-4 in the Men's Final in Arthur Ashe Stadium at the US Open Tennis Championships at the USTA Billie Jean King National Tennis Center in New York City on September 13, 2015. Photo by Ray Stubblebine/UPI

Novak Djokovic of Serbia lifts up the trophy after he beat Roger Federer of Switzerland 6-4, 5-7, 6-4, 6-4 in the Men's Final in Arthur Ashe Stadium at the US Open Tennis Championships at the USTA Billie Jean King National Tennis Center in New York City on September 13, 2015. Photo by Ray Stubblebine/UPI

Anna Wintour and David Beckham attend the Roger Federer vs Novak Djokovic men's final match at Arthur Ashe Stadium during the US Open Tennis Championships at the USTA Billie Jean King National Tennis Center in New York City on September 13, 2015. Photo by Monika Graff/UPI