The Biggest Casino Wins in the History of US Online Gambling

by Kevin Lentz, 17 September 2025

Some players hit nice wins that they can brag to their friends about; others hit jackpots so massive that they make history. Let’s take a quick look back at the biggest casino wins ever in US online gambling history, wins so big they went into the record books.

Slot machine jackpots continue to climb to new records © Vines Zoo Contact, Pixabay

Biggest Online Casino Wins in US History

When New Jersey first legalised online casinos way back in 2013, few could have imagined that online slot jackpots would someday grow into the tens of millions of dollars.

But the huge jackpots now on offer only continue to grow, with each year seeing new records, and now a more than $16 million jackpot, which will be one of the largest casino wins in history, just waiting for someone to hit.

In recent years, large online operators like FanDuel and DraftKings have introduced library-wide progressives. Фor wagering an extra 10 cents or a quarter, you can buy your way into a progressive pool that links across entire libraries of games. This means that you are eligible for such a big prize no matter which slot you’re playing.

Since every eligible spin across the state contributes to the same progressive pool, these jackpots grow ultra-fast and can reach jaw-dropping amounts. These newest progressive types are expected to mint even larger jackpot millionaires as their meters grow, and more people become enamoured of them.

And you can expect more and more operators to adopt this simple way to build huge jackpots quickly as well, as it attracts both player attention and PR buzz to their slot floors.

In February 2025, DraftKings awarded an Irish Pot Luck slot player in Michigan $9.28 million for his 20-cent spin. That win became the biggest casino win in US history, so far anyway. For DraftKings, it was the kind of publicity that money can’t buy. And it shows how quickly today’s progressive slot jackpots can snowball.

Even better, the jackpot resets to $1 million every time it hits. That guarantees the prize pool never falls back to the modest amounts seen in the early days of online gambling. It’s a sign of how far the market has come in a little more than a decade.

For perspective though, Europe still holds the crown for the single largest online slot jackpot: a whopping $23 million on Microgaming’s Mega Moolah. But the US is catching up fast.

Garden State Jackpots

New Jersey, the birthplace of regulated online casinos in the US, has also produced some big winners.

The second-largest online slot jackpot also hit on a statewide progressive, but this time on the BetMGM “The Big One”, which was available on select machines across all BetMGM sites such as Borgata, Wheel of Fortune Casino, and PartyCasino.

While the jackpot hit on a Fruit Blaster machine, other titles linked in this progressive include MGM Grand Millions, Book of Myths, and Luck o’ the Jackpot. The lucky winner walked away with $6.4 million on August 19th, 2024, which briefly ranked it among the buggest casino wins ever in US online gambling history.

And which, yet again, showed statewide library progressives delivering eye-popping results. It also cemented BetMGM’s reputation among the top paying online casinos.

The third-largest jackpot also hit BetMGM on one of their MGM Grand Millions in late November 2021. A player going by the name Dori B, playing ten dollars a spin, turned that into $3.5 million in one lucky reel pull. This would rank as the biggest casino win ever in the US for almost three years.

Unlike the newer statewide progressives, this one was tied to a single title, proving that even individual titles occasionally make for huge winners.

All Eyes Back On Michigan

While New Jersey remains a leader in the industry, Michigan is quickly emerging as a hotbed for huge jackpots. The same DraftKings progressive that produced the $9.28 million winner in February 2025 had already climbed to over $16 million by early August.

That will make it the largest casino win in history here in the States and rank it amongst the biggest casino wins ever, even globally. And it’s just waiting to be hit!

So, if you are from the state or visiting, and you’ve got twenty cents burning a hole in your pocket, maybe your name could be at the top of this list. One thing is certain; somebody is going to become a multi-millionaire very soon.

Sportsbook Mega Bets

Of course, there are lots of other million-dollar paydays to be had in online casinos, and ever since the Supreme Court struck down PAPSA in 2018, there has been a tremendous wave of headline-grabbing sportsbook wagers.

In this year’s NBA playoff finals, one Ohio player wagered $8 million in a single bet that the Oklahoma City Thunder would beat the Indiana Pacers in the best-of-seven series, which they ultimately did in the seventh game, making for a nail-biter of a bet. Unfortunately, the bet paid -700, meaning the lucky bettor only won $1.14 million.

Mattress store owner Jim “Mattress Mack” McIngvale routinely places million-dollar sports bets, hedged by customer promotions at his many mattress stores, including a legendary $10 million bet on the Astros to win the World Series in 2022.

This winning bet paid $75 million, at least some of which went to pay back his mattress customers, who received their purchase for free if Houston won, making this the largest casino win in history for US sportsbooks.

Biggest Online Poker Wins

Online poker has also produced its share of multimillion-dollar online payouts. The biggest being in 2023 during the WSOP when Bert “girafganger7” Stevens captured the WSOP Online main event and took home a $2.78 million dollar payday for besting over 6,000 other entrants. This remains one of the biggest casino wins ever for an online WSOP tournament.

Poker, unlike slots, blends a huge amount of skill, and instead of getting lucky on one spin, you often need to outlast thousands of other, equally skilled players, through a days-long tournament.

The Future of Big Wins

From furiously spinning slot reels to sportsbook slips and online poker tables, the past 12 years have seen an explosion of life-changing jackpots as online gaming took hold.

The days of a six-figure jackpot grabbing any media attention are gone, and now 8-figure slot jackpots or even sportsbook payouts are almost the norm.

Whether the next multi-million dollar winner comes from a 20-cent spin, a perfectly timed poker run, or a gutsy sports bet, the one thing that is certain is that today’s records will be topped in the not so very distant future.

And for operators and gamblers alike, that is the allure: the chance to rewrite these records with one single win and go down in the books with the biggest casino win in history. The only question is who will be next?