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LONDON, ENGLAND - JULY 11: Serena Williams (USA) and Garbine Muguruza (ESP) pose with their trophies after the ladies final on day twelve of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 11, 2015 in London, England. (Photo by Marc Atkins/Mark Leech/Getty Images)

LONDON, ENGLAND - JULY 11: Serena Williams (USA) and Garbine Muguruza (ESP) pose with their trophies after the ladies final on day twelve of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 11, 2015 in London, England. (Photo by Marc Atkins/Mark Leech/Getty Images)