Caroline Wozniacki of Denmark celebrates winning against Camila Giorgi of Italy during their third round match for the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 04 July 2015. EPA/ANDY RAIN

Spectators on the grounds during the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 04 July 2015. EPA/GERRY PENNY

Timea Bacsinsky of Switzerland celebrates her win over Sabine Lisicki of Germany in their third round match during the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 04 July 2015. EPA/FACUNDO ARRIZABALAGA

Viktor Troicki of Serbia in action against Dustin Brown of Germany during their third round match for the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 04 July 2015. EPA/ANDY RAIN

A general view of Centre Court as Roger Federer of Switzerland plays Samuel Groth of Australia in their third round match during the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 04 July 2015. EPA/GERRY PENNY