2015 U.S. Open men's final: Roger Federer vs. Novak Djokovic
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.
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,.
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.
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)
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.
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.
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.
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.
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.