LONDON, ENGLAND - JULY 04:  Angelique Kerber of Germany plays a backhand during the Womens Singles Third Round match against Garbine Muguruza of Spain during day six of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 4, 2015 in London, England.  (Photo by Shaun Botterill/Getty Images)