Ying-Ying Duan of China returns to Roberta Vinci of Italy during their second round match at the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 30 June 2016 EPA/GERRY PENNY

Julien Benneteau of France returns to Kei Nishikori of Japan in their second round match during the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 30 June 2016. EPA/HANNAH MCKAY

Belinda Bencic of Switzerland returns to Julia Boserup of the US in their second round match during the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 30 June 2016. EPA/FACUNDO ARRIZABALAGA

Garbine Muguruza plays Jana Cepelova of Slovakia in their second round match during the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 30 June 2016. EPA/ANDY RAIN

Johanna Konta of Britain takes a fall as she plays Eugenie Bouchard of Canada in their second round match during the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 30 June 2016. EPA/HANNAH MCKAY