As Rory McIlroy makes another run at a green jacket at the Masters, attention naturally turns to the player — but just as important is the man on the bag.
Harry Diamond has served as McIlroy’s caddie since 2017, bringing a unique mix of trust, familiarity, and competitive experience to one of golf’s most high-profile partnerships.
Here are five key facts to know about Diamond.
1. He Replaced J.P. Fitzgerald in 2017
Diamond became McIlroy’s full-time caddie in 2017 after the Northern Irish star parted ways with longtime caddie J.P. Fitzgerald.
Fitzgerald had been on the bag for all four of McIlroy’s major championships, making the split one of the more surprising moves on tour at the time. The two had worked together for nearly a decade, forming one of golf’s most successful player-caddie partnerships.
McIlroy later indicated the decision came down to a need for a different dynamic as he looked to reset his game during a challenging stretch in 2017.
Diamond initially stepped in on a short-term basis but quickly became a permanent fixture.
He has remained in the role ever since. And their partnership remains one of the most consistent on tour.
2. He’s One of McIlroy’s Closest Friends
Diamond and McIlroy grew up together in Holywood, Northern Ireland, and have known each other since their junior golf days.
McIlroy has consistently described Diamond as “like a big brother,” highlighting a relationship built on trust that extends well beyond the course.
That connection was a major factor in McIlroy’s decision to bring him onto the bag.
3. He Was a Top Amateur Golfer
Diamond had a successful amateur career before transitioning away from competitive golf.
He won the 2012 West of Ireland Championship, a prestigious amateur title, and earned a place in that year’s Irish Open. While he did not pursue a long-term professional career, his playing background gives him a strong understanding of high-level competition.
4. He Brings a Calm, Steady Presence
Diamond is known for his quiet, composed approach on the course.
Rather than being overly vocal, he plays a stabilizing role, helping McIlroy manage pressure and stay focused during rounds. That dynamic has been a defining part of their partnership, particularly in high-stakes events.
5. He’s Been on the Bag for Multiple PGA Tour Wins
GettyRory McIlroy celebrates with caddie Harry Diamond after winning the 2025 Masters Tournament at Augusta National Golf Club.
Since taking over in 2017, Diamond has been alongside McIlroy for numerous PGA Tour victories and key moments in his career.
While the partnership has faced scrutiny during major championship close calls, McIlroy has consistently defended Diamond, emphasizing the importance of trust and continuity in their working relationship.
The Bigger Picture
GettyRory McIlroy celebrates with caddie Harry Diamond after winning his singles match during the 2023 Ryder Cup in Rome, Italy.
Harry Diamond’s role goes far beyond carrying the bag.
As one of Rory McIlroy’s closest friends and a steady presence under pressure, he remains a central figure in the world No. 1’s pursuit of another major title — including this week at Augusta National.
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