Champs party: Serena, Azarenka, Nadal rock

(L-R) Tennis players Juan Martin del Potro, Serena Williams, Managing Director and Head of Corporate Communications at BNP Paribas Americas Michele Sicard, Victoria Azarenka and Rafael Nadal attend the BNP Paribas Tennis Showdown cocktail party at Essex House on March 3, 2013 in New York City. (GETTY)

Musician Redfoo and tennis Player Victoria Azarenka attends the BNP Paribas Tennis Showdown cocktail party at Essex House on March 3, 2013 in New York City. (GETTY)

Tennis players Serena Williams and Juan Martin del Potro attend the BNP Paribas Tennis Showdown cocktail party at Essex House on March 3, 2013 in New York City. (GETTY)

Tennis players Juan Martin del Potro and Rafael Nadal attend the BNP Paribas Tennis Showdown cocktail party at Essex House on March 3, 2013 in New York City. (GETTY)

Tennis players Serena Williams and Victoria Azarenka attend the BNP Paribas Tennis Showdown cocktail party at Essex House on March 3, 2013 in New York City. (GETTY)

Tennis Player Victoria Azarenka attends the BNP Paribas Tennis Showdown cocktail party at Essex House on March 3, 2013 in New York City. (GETTY)

Tennis player Serena Williams attends the BNP Paribas Tennis Showdown cocktail party at Essex House on March 3, 2013 in New York City. (GETTY)

(L-R) Tennis players Rafael Nadal, Juan Martin del Potro, Victoria Azarenka and Serena Williams attend the BNP Paribas Tennis Showdown cocktail party at Essex House on March 3, 2013 in New York City. (GETTY)