Rory McIlroy can do his father proud, and make him much richer, on Sunday by winning the British Open at Hoylake.
For 10 years ago, 25-year-old McIlroy's dad Gerry and three friends each placed a Â£100 ($170, 125 euros) bet at odds of 500/1 that his son would become Open champion before he turned 26.
The end result of that would be an overall jackpot of Â£200,000 (340,000 dollars, 250,000 euros), for the quartet, while McIlroy would pocket a cool million pounds for winning the third major of his young career.
The Northern Irishman already has two major titles under his belt -- the first in the US Open at Congressional in 2011 and the second in the US PGA Championship at Kiawah Island the following year. He won both of them by eight shots.
On Sunday he will take a six-shot lead into the final round at Hoylake and few people would bet against him winning again despite the last day collapse that cost him the Masters title in 2011 when he led by four before Sunday.
McIlroy's father is not the only one eager to see him complete the job. One punter stands to earn a Â£80,000 ($135,000, 100,000 euros) windfall if he closes the deal, according to British bookmakers Ladbrokes.
Back in 2005 a shop customer had the foresight to place a Â£200 wager on a then teenage McIlroy to win The Open before 2015 at odds of 250/1.
He also placed a second bet on the Northern Irishman to do so before he turned 50 at 150/1 -- leaving him to collect just over Â£80,000 profit should McIlroy hold aloft the Claret Jug on Sunday for the first time.
The bookies are already sweating about a potential Â£2 million total payout should he be victorious at Hoylake.
Ladbrokes spokeswoman Jessica Bridge said: "Patience is a virtue, and that's clearly something this punter has in abundance after waiting nearly 10 years to collect his Â£80k winnings.
"It'll be the final nail in our coffin over Rory's payout, but we can only doff our cap to his foresight."
Ladbrokes latest betting for The Open winner on Saturday after the third round were:
Rory McIlroy -- 1/25, Rickie Fowler -- 16/1, Sergio Garcia -- 25/1, Dustin Johnson -- 25/1, Victor Dubuisson -- 80/1, Adam Scott -- 100/1.