LONDON, ENGLAND - JULY 16:  Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge and welcomed by Gill Brook in the centre court royal box prior to the Gentlemen's Singles final between Roger Federer of Switzerland and Marin Cilic of Croatia on day thirteen of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club at Wimbledon on July 16, 2017 in London, England.  (Photo by Clive Brunskill/Getty Images)