
Novak Djokovic of Serbia returns the ball during a round of 16 match Pablo Carreno Busta of Spain at the ATP World Tour Masters Monte Carlo in Roquebrune-Cap-Martin, France on April 20, 2017. Novak Djokovic won 2-1. (Xinhua/Sebastien Darrasse)

Novak Djokovic of Serbia returns the ball during a round of 16 match Pablo Carreno Busta of Spain at the ATP World Tour Masters Monte Carlo in Roquebrune-Cap-Martin, France on April 20, 2017. Novak Djokovic won 2-1. (Xinhua/Sebastien Darrasse)