A Houston man just rocked the baseball playoff betting world.

Jim McIngvale, a furniture store owner known as “Mattress Mack,” placed a $3.5 million bet Tuesday on the Houston Astros to win the World Series at the DraftKings sportsbook at Scarlet Pearl casino in Biloxi, Miss., according to ESPN.

The bet, at +220 odds, would pay a net $7.7 million if the Astros — the American League’s No. 1 seed — win the World Series.

McIngvale, 68, also recently placed a $200,000 World Series bet on the Astros +250 at the South Point in Las Vegas and has additional wagers for undisclosed amounts with Nevada bookmakers Caesars, MGM, Treasure Island and Circa Sports, according to the report.

The massive bets are a hedge against the millions of dollars McIngvale would lose if the Astros win the World Series. His Gallery Furniture stores have been running a “Win It All” promotion to refund customers on purchases over $3,000 if the Astros go all the way. McIngvale has said it would lead to a $15 million loss for his business; in 2017, when the Astros won, he was out more than $10 million due to the same promotion. The seven figures in action would help “Mattress Mack” recoup most of his losses.

The $3.5 million wager made at the Scarlet Pearl is one of the largest bets ever taken by a U.S. bookmaker. It’s nearly equal to how much was bet on baseball at Mississippi sportsbooks in the months of June, July and August combined.

“I think it’s the biggest [bet] that’s ever happened in Mississippi,” DraftKings chief revenue officer and co-founder Matt Kalish told the website.

Plus, McIngvale’s huge bet means the Yankees are no longer the most heavily bet team to win it all at DraftKings.

Before the wager, more money had been bet on the Yankees to win the World Series at DraftKings than had been bet on any other team. The Yankees are +425.

“This does change the picture for us a little bit,” Kalish said Tuesday. “This will make the Astros the biggest liability.”

Though this was a sizable wager, it’s not the biggest made on a sporting event.

Robert Walker — a longtime Las Vegas bookmaker — told ESPN in 2002 he took a $4.8 million money-line bet on the St. Louis Rams to beat the New England Patriots straight-up in Super Bowl XXXVI. The Patriots upset the Rams 20-17.

But it is rare to see this a multi-million-dollar wager made on a World Series future bet.