A spectators studies the match fixtures ahead of play during the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 02 July 2016. EPA/HANNAH MCKAY

Angelique Kerber of Germany returns to compatriot Carina Witthoeft in their third round match during the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 02 July 2016. EPA/GERRY PENNY

Andrey Kuznetsov of Russia returns to Kei Nishikori of Japan in their third round match during the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 02 July 2016. EPA/ANDY RAIN

Former England footballer David Beckham in the Royal Box on Centre Court during the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 02 July 2016. EPA/HANNAH MCKAY

Yet another rain delay in the third round match between Sam Querrey of the US (R) and Novak Djokovic of Serbia during the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 02 July 2016. EPA/FACUNDO ARRIZABALAGA