Nadal, Serena win US Open

Serena Williams, greets Victoria Azarenka, of Belarus, at the net after winning the women's singles final of the 2013 U.S. Open tennis tournament in New York. (AP Photon)

2. Serena Williams reacts after defeating Victoria Azarenka, of Belarus, during the women's singles final of the 2013 U.S. Open tennis tournamentin New York. (AP Photo)

Serena Williams shows her excitement post defeating Victoria Azarenka in New York. (AP Photo)

2013 U.S. Open Women's Singles tennis champion Serena Williams poses with her trophy in Central Park in New York.

Williams defeated Victoria Azarenka 7 5, 6 7 (6), 6 1 on Sunday. (AP Photo)

Rafael Nadal, of Spain, greets Novak Djokovic, of Serbia, at the net after winning the men's singles final of the 2013 U.S. Open tennis tournament, in New York. (AP Photo)

Rafael Nadal, of Spain, lays on the court with joy of winning the tournamentin New York. (AP Photo)

Rafael Nadal, of Spain, holds up the championship trophy after winning the men's singles final over Novak Djokovic, of Serbia, at the 2013 U.S. Open tennis tournament in New York. (AP Photo)

Novak Djokovic, of Serbia, and Rafael Nadal, of Spain, pose for photos after Nadal won the men's singles final of the 2013 U.S. Open tennis tournament, Monday, Sept. 9, 2013, in New York. (AP Photo)