Harry Diamond stands to pocket a substantial windfall following Rory McIlroy's triumph at Augusta National on Sunday.
The caddie, who has been by McIlroy's side since 2017, is anticipated to receive between £288,000 and £360,000 from the Northern Irishman's record-breaking victory.
According to Golf Monthly, professional golfers typically share approximately 10 per cent of their winnings with their caddies.
Some players opt for a fixed percentage arrangement regardless of tournament placement.
Diamond's expected bonus dwarfs the typical UK salary, with the upper estimate of £360,000 representing roughly 995 per cent more than the national average wage of £32,890.
The payout marks an increase from last year's Masters, when Diamond reportedly earned between £268,800 and £336,000.
McIlroy's victory on Sunday secured his place among golf's elite, joining Jack Nicklaus, Nick Faldo and Tiger Woods as only the fourth player to successfully defend the Masters title.
Harry Diamond stands to pocket a substantial windfall following Rory McIlroy's triumph at Augusta National on Sunday
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The 36-year-old held off challenges from Justin Rose and Scottie Scheffler to claim the green jacket for a second consecutive year.
His prize of $4.5million (£3.6m) set a new record for the tournament, though tax obligations in both the United States and United Kingdom will claim nearly half of that sum.
The six-time major champion has now accumulated $13.04m (£10.35m) across 18 appearances at Augusta National, making him the highest-earning competitor in Masters history.
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Harry Diamond's partnership with McIlroy stretches back nearly a decade, with the caddie joining the six-time major winner's team in 2017
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According to PGA figures, McIlroy ranks as the second-highest-earning golfer in history, trailing only Tiger Woods.
Since turning professional in 2007, the Northern Irishman has amassed career earnings of $114,696,641 (£90.8m).
Diamond's partnership with McIlroy stretches back nearly a decade, with the caddie joining the six-time major winner's team in 2017.
McIlroy has spoken movingly about his bond with Diamond, describing the caddie as a surrogate sibling.
"I think as an only child he was like the big brother I never had, you know?" McIlroy said earlier this month.
Rory McIlroy shares a hug with his father, Gerry, following his Masters triumph at Augusta | GETTY"And I think that's what makes it so special."
The golfer noted that while Diamond grew up with siblings of his own, including a younger brother and older sister, their relationship has taken on a familial quality.
"But I always felt like Harry was my big brother," McIlroy explained.
"And I feel like that's why when I talk about it or, you know, it's why it makes me emotional."