Last week, a bettor wagered $US85,000 that Woods would break his 11-year drought in the Majors at Augusta National at the odds of $15.
When Woods rolled in his bogey putt on 18 to seal a one-shot victory, the bet had earned the gambler $US1.19 million ($NZ1.65 million).
It was the largest payout in the history of the William Hill US sportsbook in Nevada.
"It's great to see Tiger back," Nick Bogdanovich, director of trading for William Hill U.S. said - likely through gritted teeth - in a release.
"It's a painful day for William Hill - our biggest loss ever - but a great day for golf."