When the player's name was called - 'Mr Andrew Murray For Services to Tennis' - William gave a broad grin and the pair talked animatedly for around a minute, noticeably longer than any of the other recipients.
The tennis star was receiving the honour from the Duke of Cambridge, who was hosting his first investiture ceremony on behalf of the Queen.
Chat: The Duke of Cambridge spoke to the tennis star for longer than any other of the award winners''
He is now in a 'transitional' year, sources have said, and is considering options for his public service.
Yasemekana kwamba His grandmother the Queen and grandfather the Duke of Edinburgh advancing in years, there is speculation that William may take on extra responsibilities.
William arrived in the gilt and scarlet palace ballroom attended by two Gurkha Orderly Officers, a tradition begun in 1876 by Queen Victoria.
On duty were five members of The Queen's Body Guard of the Yeomen of the Guard, which was created in 1485 by King Henry V11 after his victory at the Battle of Bosworth Field - making them both the oldest royal bodyguard and also the oldest military corps existing in the UK.
William waited for the name of each recipient to be announced before taking the decoration from a velvet cushion and pinning them onto the recipient's lapel.