Richard Gasquet of France hits a return shot to Adrian Mannarino of France in their first round match of the Western & Southern Open tennis championships at the Linder Family Tennis Center in Mason, near Cincinnati, Ohio, 16 August 2016. EPA/TANNEN MAURY

Gael Monfils of France hits a return shot to Pablo Carreno Busta of Spain in their first round match of the Western & Southern Open tennis championships at the Linder Family Tennis Center in Mason, near Cincinnati, Ohio, USA, 16 August 2016. EPA/TANNEN MAURY

Stan Wawrinka of Switzerland hits a return shot to Jared Donaldson of the US in their first round match of the Western & Southern Open tennis championships at the Linder Family Tennis Center in Mason, near Cincinnati, Ohio, USA, 16 August 2016. EPA/TANNEN MAURY