The South Point Hotel Casino & Spa said the Megabucks payout was Nevada’s largest jackpot of the year.
The player won on a $5 wager, according to a news release that said the winner did not want to be publicly identified.
Megabucks is manufactured and operated by London-based International Game Technology.
The jackpot at the south Las Vegas Strip property came just hours after a tourist from Alaska won more than $2.1 million with a $40 bet on a Monopoly Millionaire slot machine at The Cosmopolitan.
That winner’s name also was not released.