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Britain's Andy Murray trains on day eleven of the 2013 Wimbledon Championships tennis tournament at the All England Club in Wimbledon, southwest London, on July 5, 2013, ahead of his men's singles semi-final match. AFP PHOTO / GLYN KIRK - RESTRICTED TO EDITORIAL USE (Photo credit should read GLYN KIRK/AFP via Getty Images)

Britain's Andy Murray trains on day eleven of the 2013 Wimbledon Championships tennis tournament at the All England Club in Wimbledon, southwest London, on July 5, 2013, ahead of his men's singles semi-final match.  AFP PHOTO / GLYN KIRK -  RESTRICTED TO EDITORIAL USE        (Photo credit should read GLYN KIRK/AFP via Getty Images)