Police officers observe the national minute of silence for the victims of the terror attacks in Tunisia during the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 03 July 2015. EPA/ANDY RAIN

Nick Kyrgios of Australia in action against Milos Raonic of Canada during their third round match for the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 03 July 2015. EPA/GERRY PENNY

Roger Federer fans on Centre Court celebrate his second round win over Sam Querry of USA during the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 02 July 2015. EPA/FACUNDO ARRIZABALAGA

Spectators observe a minute of silence in memory of the victims of the Tunesia attacks during the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 03 July 2015. EPA/FACUNDO ARRIZABALAGA

Stan Wawrinka of Switzerland in action against Fernando Verdasco of Spain during their third round match for the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 03 July 2015. EPA/FACUNDO ARRIZABALAGA