Key keywords: Rory McIlroy caddie, Harry Diamond, PGA Tour caddie, professional golf caddie, Rory McIlroy team, The Open Championship caddie, DP World Tour caddie, Ryder Cup caddie, major championship caddie, golf player-caddie partnership For golf fans tuning into PGA Tour, DP World Tour, and major championship events, Rory McIlroy’s consistent top finishes have long been a highlight — but many viewers are curious about the man standing right beside him on every fairway and green: his caddie, Harry Diamond. The pair share a decades-long bond that far predates their professional partnership, both hailing from the small town of Holywood in Northern Ireland, where they grew up playing junior golf together as teenagers. Before taking on the role as McIlroy’s full-time caddie in 2017, Diamond was a talented amateur golfer himself, even competing in top regional amateur events across the UK and Ireland. McIlroy had previously worked with high-profile caddie JP Fitzgerald for 9 years, a partnership that yielded four major championship titles, but the pair parted ways in 2017 after a stretch of inconsistent results. Diamond initially stepped in as a temporary fill-in for a few events, but his easy chemistry with McIlroy, deep knowledge of his playing style, and calm demeanor under pressure made the arrangement permanent within months. As a caddie, Diamond’s responsibilities extend far beyond carrying McIlroy’s 30-pound golf bag across 72-hole tournament courses. He is tasked with calculating precise yardages accounting for wind, elevation, and course conditions, advising on club selection, reading complex green contours to help McIlroy line up putts, and even providing emotional support during high-stakes moments. His impact has been tangible: the pair have notched over 10 PGA Tour wins together, including the 2022 Canadian Open, 2023 Scottish Open, and were key members of the winning European Ryder Cup team in 2023, where Diamond’s strategic input helped McIlroy secure four points for his side. Off the course, the pair remain close friends: Diamond served as a groomsman at McIlroy’s 2017 wedding to Erica Stoll, and their families regularly vacation together during the PGA Tour off-season. Industry insiders estimate that as a top-tier caddie for one of the highest-earning golfers in history, Diamond earns a base weekly salary plus an 8-10% cut of McIlroy’s tournament prize money, which has totaled over $120 million in on-course earnings over the course of his career. The pair have openly discussed their goal of winning the next round of major championships together, with McIlroy repeatedly stating that Diamond’s presence gives him a competitive edge no other caddie could match.