Grigor Dimitrov of Bulgaria in action during his semi-final match against Novak Djokovic of Serbia at the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 04 July 2014. EPA/ANDY RAIN

Grigor Dimitrov of Bulgaria scores against Novak Djokovic of Serbia in their semi final match during the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 04 July 2014. EPA/TATYANA ZENKOVICH

Grigor Dimitrov of Bulgaria scores against Novak Djokovic of Serbia in their semi final match during the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 04 July 2014. EPA/TATYANA ZENKOVICH

Grigor Dimitrov of Bulgaria scores against Novak Djokovic of Serbia in their semi final match during the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 04 July 2014. EPA/TATYANA ZENKOVICH

Russian tennis player Maria Sharapova (C) watches the action from the Royal Box during the semi-final match between Novak Djokovic of Serbia and Grigor Dimitrov of Bulgaria at the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 04 July 2014. EPA/ANDY RAIN