HOYLAKE, England (REUTERS) - Gerry McIlroy was £100,000 (S$212,000) richer on Sunday following his son Rory's two-stroke victory in the 143rd British Open at Royal Liverpool.

Ladbrokes said in a news release that Gerry had placed a 500-1 bet on his son a decade ago to land the coveted Claret Jug within 10 years.

"Although we're facing heavy losses, we can't help but admire the foresight of Rory's dad and his pals a decade ago," added a spokesman for the British bookmaker.

Two friends of Rory's father also collected nearly £80,000 from a similar wager.

"They are all going to be very happy," said McIlroy junior. "My dad has never reminded me but I knew he'd done it - it's a nice little bonus."

McIlroy's victory, his third in a major after the 2011 US Open and 2012 US PGA Championship triumphs, means he only needs the US Masters to complete a grand slam of golf's "Big Four" prizes.

"It's an 8/1 shot McIlroy wears the Green Jacket at Augusta in 2015 and just 1/2 at any time in his career," said Ladbrokes.