Maria Sharapova of Russia in action against Richel Hogenkamp of the Netherlands during their second round match for the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 01 July 2015. EPA/FACUNDO ARRIZABALAGA

Spectators on Aorangi Terrace quench their thirst during a hot day at the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 01 July 2015. EPA/ANDY RAIN

Grigor Dimitrov in Bulgaria in action against Steve Johnson of the USA during their second round match for the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 01 July 2015. EPA/FACUNDO ARRIZABALAGA

Nick Kyrgios of Australia in action against Juan Monaco of Argentina during their second round match for the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 01 July 2015. EPA/GERRY PENNY

Marin Cilic of Croatia in action against Ricardas Berankis of Lithuania during their second round match for the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 01 July 2015. EPA/ANDY RAIN