Lee Westwood shot a 12-under-par 60 - the best round of his career - to establish a five-shot lead on day one of the Thailand Golf Championship.
The Englishman carded 10 birdies and an eagle at the Amata Spring Country Club.
"I made a dream start and you start thinking about 59, I guess," said Westwood, the world number three.
Westwood set the tone for his round with birdies at one, three, four and five and an eagle at the par-five second.
"I guess 59 is one of those numbers where if it is meant to be, it is meant to be. I messed it up with a few pars!"
American John Daly is Westwood's closest challenger after the two-time major winner carded a 65.
He picked up another shot at the seventh to reach the turn in 29 and a further five birdies coming home maintained his momentum.
Westwood's round was even more remarkable given the tricky wind in Chonburi.
"It's not really a 60 course," he added. "It was a bit breezy out there.
"[Caddie] Billy [Foster] said he thought he had seen the best round of golf ever when I shot 62 at the Nedbank a few weeks ago but he said that was better today, so I am making progress!"