LONDON, ENGLAND - JULY 03: Juan Martin Del Potro of Argentina grimaces after slipping on the grass during the Gentlemen's Singles quarter-final match against David Ferrer of Spain on day nine of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club at Wimbledon on July 3, 2013 in London, England. (Photo by Dennis Grombkowski/Getty Images)
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