Wimbledon legend is such good friends with Kate Middleton she kissed him on the cheek 3 times

ok.co.uk:

Kate Middleton is known for her competitive side and love of all things sports and often appears to show her support at many big sporting events throughout the year.The Duchess of Cambridge, 40, serves as the patron for a number of important sporting organisations such as the Rugby Football Union and the All England Lawn Tennis and Croquet Club.The royal is also a frequent visitor to Wimbledon every year and is often seen cheering and clapping during the various matches from the highly famed royal box, though there is one tennis legend who is a very close friend of hers.

Swiss player and tennis legend Roger Federer is a close friend of the Duchess’ and even attended her sister Pippa's wedding to James Matthews in 2017.

During the same year, photographs emerged of Kate congratulating the tennis legend on his success at Wimbledon during a reception while Prince William watched on.

Roger, 40, is thought to be one of The Duke and Duchess of Cambridge's inner circle of celebrity friends. Back in 2017, after his success at Wimbledon, Kate stunned royal fans when she was pictured giving the player three kisses in congratulations of his historic win before Roger shook hands with Prince William.