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Britain's Prince William, Duke of Cambridge (L) and Sophie, Countess of Wessex (R) take their seats in the royal box on centre court to watch the men's singles quarter-final match between Britain's Andy Murray and Canada's Vasek Pospisil on day nine of the 2015 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 8, 2015. RESTRICTED TO EDITORIAL USE -- AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/Getty Images)

Britain's Prince William, Duke of Cambridge (L) and Sophie, Countess of Wessex (R) take their seats in the royal box on centre court to watch the men's singles quarter-final match between Britain's Andy Murray and Canada's Vasek Pospisil on day nine of the 2015 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 8, 2015.   RESTRICTED TO EDITORIAL USE  --   AFP PHOTO / LEON NEAL        (Photo credit should read LEON NEAL/AFP/Getty Images)