Novak Djokovic performs a push up on the court during play against Andy Murray in the BNP Paribas Showdown Tennis Tournament on Monday, March 3, 2014, in New York. Djokovic won 6-3, 7-6. (AP Photo/Kathy Kmonicek)

BNP Paribas Showdown Tennis

Novak Djokovic performs a push up on the court during play against Andy Murray in the BNP Paribas Showdown Tennis Tournament on Monday, March 3, 2014, in New York. Djokovic won 6-3, 7-6. (AP Photo/Kathy Kmonicek)

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