Novak Djokovic, of Serbia, holds his trophy after winning the Sony Open Tennis in Key Biscayne, Fla., Sunday, March 30, 2014, in Key Biscayne, Fla., defeating Rafeal Nadal, of Spain, 6-3, 6-3. (AP Photo/J Pat Carter)
Novak Djokovic, of Serbia, holds his winner's trophy after defeating Rafeal Nadal, of Spain, 6-3, 6-3 during the Sony Open Tennis in Key Biscayne, Fla., Sunday, March 30, 2014. (AP Photo/J Pat Carter)
Novak Djokovic of Serbia, celebrates after defeating Rafael Nadal of Spain, 6-3, 6-3 during the men's final match at the Sony Open Tennis tournament on Sunday, March 30, 2014, in Key Biscayne, Fla. (AP Photo/Wilfredo Lee)
Rafael Nadal, of Spain, returns a shot from Novak Djokovic, of Serbia, during the men's final match at the Sony Open Tennis tournament on Sunday, March 30, 2014, in Key Biscayne, Fla. (AP Photo/J Pat Carter)
Novak Djokovic, of Serbia, serves to Rafael Nadal, of Spain, during the men's final match at the Sony Open Tennis tournament on Sunday, March 30, 2014, in Key Biscayne, Fla. (AP Photo/Lynne Sladky)
Rafael Nadal, of Spain, returns a shot from Novak Djokovic, of Serbia, during the men's final match at the Sony Open Tennis tournament on Sunday, March 30, 2014, in Key Biscayne, Fla. (AP Photo/J Pat Carter)
Novak Djokovic, of Serbia, waves after defeating Rafael Nadal, of Spain, 6-3, 6-3 during the men's final at the Sony Open Tennis tournament on Sunday, March 30, 2014, in Key Biscayne, Fla. ( AP Photo/J Pat Carter)