Rory McIlroy revealed the perfect Christmas gift handed to him by caddie Harry Diamond to celebrate his historic Grand Slam.The Northern Irishman enjoyed a spectacular year by winning The Masters following a tense play-off to become just the sixth man in history to win all four majors in golf.McIlroy finally got his hands on the famous green jacket at Augusta to become a Grand Slam championAnd it got even better for McIlroy as he helped Team Europe to Ryder Cup success in New York in September.But there is still one more honour to scoop with the BBC Sports Personality of the Year award which takes place on Thursday.The perfect giftDespite all of his success this year, McIlroy was given arguably the perfect gift of all from caddie and long-time friend Diamond.The star was presented with an Augusta National card signed by all five previous Grand Slam champions.Appearing on the Shotgun Start Podcast, McIlroy showed the guests his Augusta card containing the signatures of Tiger Woods, Jack Nicklaus, Gary Player, Gene Sarazen and Ben Hogan.And Diamond even asked McIlroy if he would like to add his signature to the exclusive card to which the 36-year-old said ‘absolutely not’, instead preferring to keep the five aforementioned names on it.But with world No.1 Scottie Scheffler just a US Open victory away from joining the illustrious group, McIlroy hopes he won’t have to add any further signatures to the card anytime soon.“I just hope I don’t have to get Scottie to sign it next year,” McIlroy said.His Masters victory was undoubtedly the personal highlight of McIlroy’s year which saw him finally land all four Majors.Through thick and thinAnd the moment was a particularly sweet one for the pair who have been best friends for many years.McIlroy enjoyed Ryder Cup success with Team EuropeGettyshotgun start podcastThe Northern Irishman showed off his signed Augusta National card[/caption]McIlroy will be playing a Ryder Cup as a Grand Slam champion for the first timeGettyDiamond has come under fire during his time alongside McIlroy with the 2024 US Open collapse, the most notable.But McIlroy has always stuck by his friend and paid tribute to Diamond following his Masters triumph in April.“I’ve known Harry since I was seven years old,” McIlroy said.“I met him on the putting green at Holywood Golf Club. We’ve had so many good times together. He’s been like a big brother to me the whole way through my life.“To be able to share this with him after all the close calls that we’ve had, all the c**p that he’s had to take from people that don’t know anything about the game, yeah, this one is just as much his as it is mine.“He’s a massive part of what I do, and I couldn’t think of anyone better to share it with than him.”