Rory McIlroy’s caddie Harry Diamond has made a fortune alongside the Northern Irishman, but how does his net worth stack up against Tiger Woods’ legendary former bagman Steve Williams?
Harry Diamond is a long-time friend of Rory McIlroy(Image: Richard Heathcote, Getty Images)
Rory McIlroy has finally laid his Augusta ghosts to rest by securing consecutive Masters titles, becoming only the fourth player in history to achieve the feat. The Northern Irish golfer spent much of the tournament leading the field before eventually fending off Scottie Scheffler to secure his second green jacket.
While McIlroy dominated the spotlight, the man standing over his shoulder, Harry Diamond, was also benefiting from a landmark day. The job of a caddie has transformed from simply carrying clubs into a crucial, high-pressure partnership and this shift is clearly reflected in the finances of those who support the game’s elite players.
Diamond, a long-time friend of McIlroy, has watched his personal wealth grow significantly after years working alongside Rory. However, even his strong financial position is still measured against the benchmark set by Tiger Woods’ iconic former caddie, Steve Williams.
The New Zealander, who worked closely with Woods from 1999 to 2011, achieved a level of wealth that had rarely been seen in the profession before. He was present for 13 of Tiger’s 15 major championship victories.
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During that extraordinary period of dominance, he built up a vast fortune. Estimates place Williams’ net worth at around $20million (£15.7m). At the peak of “Tiger-mania,” his income from prize-money cuts and endorsement deals was so substantial that he ranked among the top-earning athletes in his home nation.
His earnings closely mirrored Woods’ remarkable success rate, which frequently sat near 30 per cent – a figure that today’s professionals can scarcely match. Although Joe LaCava also collected significant earnings during Tiger’s later years, including the memorable 2019 Masters victory, it is the Williams era that still sets the standard for caddie income.
Tiger Woods’ legendary caddie Steve Williams built one heck of a fortune(Image: Getty)
Since becoming McIlroy’s full-time caddie in 2017, Harry Diamond has often come under pressure from critics – especially during the later stages of McIlroy’s decade-long pursuit of a fifth major title – but the 2025 Masters win quieted those criticisms and the 2026 victory further confirmed his importance.
The financial landscape of golf has changed dramatically since the early 2000s, with prize funds climbing to unprecedented heights. After McIlroy’s triumph at Augusta this weekend, where he claimed a record $4.5m (£3.36m) winner’s prize, Diamond is believed to have earned an impressive $450,000 (£336,000) from that single tournament.
With caddies generally taking 10 per cent of winnings and roughly seven per cent for a top-10 result, Diamond’s long-term partnership with one of the game’s leading players has made him extremely wealthy. Reports indicate his total career earnings alongside McIlroy have now exceeded €10m (£8.5m).
Diamond was by McIlroy’s side as he clinched his second successive Masters title at the weekend(Image: Getty)
The contrast between Diamond and Williams illustrates how the role has evolved. Williams worked during a time when he became almost as famous as the golfers themselves, using Tiger’s global profile to build his own reputation.
By comparison, Diamond embodies the understated professional – a dependable confidant who offers a sense of reassurance that McIlroy says “probably no one else in the world could.”
Although Williams still holds the record for the greatest net worth, Diamond is steadily narrowing the gap and if McIlroy continues his run of major victories, a new record-holder could soon emerge.
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