Fernando Verdasco of Spain returns the ball to Andy Murray of Britain during their round 2 match at the BNP Paribas 2016 Masters tennis tournament in Paris, France, 02 November 2016. EPA/IAN LANGSDON

Lucas Pouille of France serves the ball to Feliciano Lopez of Spain during their second round match for the BNP Paribas 2016 Masters tennis tournament in Paris, France, 02 November 2016. EPA/IAN LANGSDON

Jo-Wilfried Tsonga of France returns the ball to Albert Ramos-Vinolas of Spain during their second round match for the BNP Paribas 2016 Masters tennis tournament in Paris, France, 02 November 2016. EPA/IAN LANGSDON

Novak Djokovic of Serbia returns the ball to Gilles Muller of Luxembourg during their round 2 match at the BNP Paribas 2016 Masters tennis tournament in Paris, France, 02 November 2016. EPA/IAN LANGSDON

Dominic Thiem of Austria returns the ball to Jack Sock of the US during their second round match for the BNP Paribas 2016 Masters tennis tournament in Paris, France, 02 November 2016. EPA/IAN LANGSDON