
Alexander Zverev of Germany returns the ball during a round of 16 match against Rafael Nadal of Spain at the ATP World Tour Masters Monte Carlo in Roquebrune-Cap-Martin, on April 20, 2017. Rafael Nadal of Spain won 2-0. (Xinhua/Sebastien Darrasse)

Alexander Zverev of Germany returns the ball during a round of 16 match against Rafael Nadal of Spain at the ATP World Tour Masters Monte Carlo in Roquebrune-Cap-Martin, on April 20, 2017. Rafael Nadal of Spain won 2-0. (Xinhua/Sebastien Darrasse)