Groundskeepeers use blowers and towels to try the courts after rain forced a delay in play at the Western & Southern Open tennis championships at the Linder Family Tennis Center in Mason, near Cincinnati, Ohio, 16 August 2016. EPA/TANNEN MAURY

Adrian Mannarino of France in action against Richard Gasquet 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

Kardina Pliskova of the Czech Republic serves to Jelena Ostapenko of Latvia in their second 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

Steve Johnson of the US hits a return shot to Federico Delbonis of Argentina 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

Pablo Carreno Busta of Spain hits a return shot to Gael Monfils 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, USA, 16 August 2016. EPA/TANNEN MAURY