According to a report published by Sports Illustrated, an online bettor won $579,000 by correctly guessing the exact scores of the Bengals' 27-24 win and the Rams' 20-17 win, and it all started with a $20 bet!
The report says the original payment was part of a free credit.
The Rams have been to four previous Super Bowls, going 1-3; the only victory came in the 1999 season while they were based in St. Louis.
Cincinnati, winner of the AFC North, hadn't won a postseason game since 1991 before beating Las Vegas, then earned a road victory in the playoffs for the first time in franchise history when it eliminated top-seeded Tennessee.
The Associated Press contributed to this report.
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