Simona Halep of Romania in action against Karolina Pliskova of the Czech Republic during the third round of the Rogers Cup tennis tournament in Montreal, Canada, 28 July 2016. EPA/ANDRE PICHETTE

Eugenie Bouchard of Canada in action against Kristina Kucova of Slovakia during the third round of the Rogers Cup tennis tournament in Montreal, Canada, 28 July 2016. EPA/ANDRE PICHETTE

Angelique Kerber of Germany serves a ball to Elina Svitolina of Ukraine during the third round of the Rogers Cup tennis tournament in Montreal, Canada, 28 July 2016. EPA/ANDRE PICHETTE

Svetlana Kuznetsova of Russia in action against Petra Kvitova of Czech Republic during the third round of the Rogers Cup tennis tournament in Montreal, Canada, 28 July 2016. EPA/ANDRE PICHETTE

Kristina Kucova of Slovakia in action against Eugenie Bouchard of Canada during the third round of the Rogers Cup tennis tournament in Montreal, Canada, 28 July 2016. EPA/ANDRE PICHETTE