The Championships - Wimbledon 2013: Day Eleven

The Championships - Wimbledon 2013: Day Eleven

Police and spectators watch Novak Djokovic of Serbia practice before playing Juan Martin del Potro of Argentina in the men's singles semi final on Centre court on day eleven of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 5, 2013 in London, England.
(July 4, 2013 - Source: Peter Macdiarmid/Getty Images Europe)