Novak Djokovic defeated Roger Federer, 6-4, 5-7, 6-4, 6-4, in the 2015 U.S. Open men's final on Sunday at Arthur Ashe Stadium.

Credit: AP / Julio Cortez

Novak Djokovic, of Serbia, follows through on a shot to Roger Federer, of Switzerland, during the men's championship match of the U.S. Open, Sunday, Sept. 13, 2015, in New York.

Credit: AP / Bill Kostroun

Roger Federer, of Switzerland, reaches to return a shot to Novak Djokovic, of Serbia, during the men's championship match of the U.S. Open, Sunday, Sept. 13, 2015,.

Credit: AP / David Goldman

Bradley Cooper, left, points to Sean Connery while watching the men's championship match of the U.S. Open between Roger Federer and Novak Djokovic, Sunday, Sept. 13, 2015.

Credit: AP

Roger Federer, of Switzerland, returns a shot to Novak Djokovic, of Serbia, during the men's championship match of the U.S. Open tennis tournament, Sunday, Sept. 13, 2015, in New York. (AP Photo/Bill Kostroun)

Credit: AP / Julio Cortez

Roger Federer, of Switzerland, can't make the play on a shot from Novak Djokovic, of Serbia, during the men's championship match of the U.S. Open, Sunday, Sept. 13, 2015.

Credit: AP / Julio Cortez

Roger Federer, of Switzerland, returns a shot to Novak Djokovic, of Serbia, during the men's championship match of the U.S. Open, Sunday, Sept. 13, 2015.

Credit: AP / David Goldman

Novak Djokovic, of Serbia, tosses a towel back to a court attendant between points against Roger Federer, of Switzerland, during the men's championship match of the U.S. Open, Sunday, Sept. 13, 2015.

Credit: AP / David Goldman

Roger Federer, of Switzerland, adjusts his headband between points while playing Novak Djokovic, of Serbia, during the men's championship match of the U.S. Open, Sunday, Sept. 13, 2015.

Credit: AP / Bill Kostroun

Novak Djokovic, of Serbia, returns a shot to Roger Federer, of Switzerland, during the men's championship match of the U.S. Open, Sunday, Sept. 13, 2015.

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