Ivo Karlovic of Croatia returns to Andy Murray of Britain in their fourth round match during the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 06 July 2015. EPA/ANDY RAIN

Ivo Karlovic of Croatia in action against Jo-Wilfried Tsonga of France during their third round match for the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 04 July 2015. EPA/SEAN DEMPSEY

Ivo Karlovic of Croatia plays Andy Murray of Britain in their fourth round match during the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 06 July 2015. EPA/ANDY RAIN

Ivo Karlovic of Croatia returns to Andy Murray of Britain in their fourth round match during the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 06 July 2015. EPA/ANDY RAIN

Ivo Karlovic of Croatia in action against Jo-Wilfried Tsonga of France during their third round match for the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 04 July 2015. EPA/SEAN DEMPSEY