Garbine Muguruza of Spain returns to Serena Williams of the US in the women’s final during the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 11 July 2015. EPA/SEAN DEMPSEY

Serena Williams of the US plays Garbine Muguruza of Spain in the women’s final during the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 11 July 2015. EPA/SEAN DEMPSEY

Garbine Muguruza of Spain in action against Serena Williams of the USA during their final match for the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 11 July 2015. EPA/DOMINIC LIPINSKI

Serena Williams of the USA in action against Garbine Muguruza of Spain during their final match for the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 11 July 2015. EPA/FACUNDO ARRIZABALAGA

Garbine Muguruza of Spain celebrates with the runners up trophy after losing against Serena Williams of the USA during their final match for the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 11 July 2015. EPA/SEAN DEMPSEY

Serena Williams of the USA celebrates with the trophy after winning against Garbine Muguruza of Spain during their final match for the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 11 July 2015. EPA/ANDY RAIN

Serena Williams of the US holds the championship trophy following her win over Garbine Muguruza of Spain (R) in the women’s final of the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 11 July 2015. EPA/FACUNDO ARRIZABALAGA