The 10 Biggest Wins in Sports Betting History

In 2019, Tiger Woods was listed with 14-1 odds at the Masters, but few professional gamblers thought he could actually win. After all, he hadn’t won a major tournament in more than a decade, but James Adducci’s confidence never wavered. He walked into a William Hill sportsbook in Las Vegas and placed an $85,000 bet on Tiger at 14-1 odds. It was Adducci’s first-ever sports bet, and whether you want to call it “beginner’s luck” or whole lot of faith, it paid off. As Tiger navigated the back nine on Sunday, the world watched in awe. When Tiger donned the Green Jacket, Adducci cashed a $1.27 million ticket, proving that sometimes, betting on a legend is far from the worst idea.

Across the pond in 2011, a 61-year-old heating engineer named Steve Whiteley took a trip to the Exeter Racecourse. He decided to play the Tote Placepot, a bet that requires picking a horse to "place" in six consecutive races. Steve’s stake? A measly £2 (roughly $3). As the day progressed, the "impossibles" kept landing. By the final race, only one horse could secure him the jackpot. When that horse crossed the line, Steve became the winner of the largest Tote payout in history, taking home £1.45 million. It’s the ultimate "average Joe" success story in the gambling world.

History was made on April 24, 2026, and it’s the type of moment all casual sports bettors dream of. A bettor at Hard Rock Casino decided to throw $30 at a six-leg home run parlay. The bet was a "dart throw" at best, as nailing six specific players to homer on the same night is essentially unheard of. The odds were an astronomical +6,576,031. One by one, the home runs started flying. Chisholm, Harper and Ohtani were among the names. When the final player cleared the fence in a late-night West Coast game, the $30 wager transformed into a staggering $1,979,970 profit. It remains the most lopsided stake-to-win ratio in the history of North American sports betting.

Long before "Vegas Dave" Oancea became a polarizing figure in the industry, he pulled off a betting heist for the ages in 2015. Dave saw potential in a Kansas City Royals team that many had written off. He began placing futures bets on the Royals to win the World Series at 30-1 odds, eventually spreading $100,000 across various Las Vegas books to avoid being capped. The rest, as they say, was history. The Royals went on to roll through the postseason, culminating in a World Series title. Dave’s foresight turned that $100k into $2.5 million, solidifying his name in the record books for one of the best futures plays ever.

"Million Dollar” Marco Piemonte has built a reputation for high-wire parlay wins, but his May 2024 heater was truly special. He constructed a four-leg monster across MLB and the NBA, staking $200,000 at DraftKings. The parlay featured one MLB favorite in the Giants (-135), two underdogs in the Rockies (+100) and Nationals (+110), along with a gutsy call on the Timberwolves to take down the Mavericks in Game 4 of the Western Conference Finals at +110. As the legs ticked off, the tension grew, but every pick landed perfectly. Marco walked away with a $3.2 million payout, netting a cool $3 million in profit. It’s the kind of win that most people only dream of.

Super Bowl LII was a nightmare for New England fans, but for one anonymous "sharp" in Las Vegas, it was the greatest night of his life. While the world was busy betting on Tom Brady to secure another ring, this bettor rolled out an estimated $3 million on the Philadelphia Eagles moneyline. Philly was an underdog listed at +160, but they went toe-to-toe with the Patriots in a high-scoring shootout. Behind the famous Nick Foles “Philly Special” and Brandon Graham’s game-sealing strip of Brady, the Eagles secured their first-ever title. The bettor turned that $3 million stake into a massive $7.8 million payout, proving that sometimes the "dog" really does have its day.

In November 2023, a Florida bettor decided that the perfect spot for a big swing was available, and it came in the form of a regular-season matchup between the Houston Texans and Cincinnati Bengals. Using the Hard Rock Bet app, this anonymous gambler placed a $500,000 four-leg Same Game Parlay. The bet needed a Texans victory, the game total to go over 44.5 points, Devin Singletary to score a touchdown and for the running back to also clear 51.5 rushing yards. Against all odds, the Texans secured a last-second field goal to win 30-27. In a flash, that $500k stake blossomed into a $5.5 million payout, marking one of the largest single-game parlay wins ever recorded in the digital age.

Billy Walters is widely considered the most successful (known) sports bettor in the world, and his 2010 Super Bowl wager is the stuff of legend. Walters saw something in the New Orleans Saints that the public missed, dropping roughly $3.5 million on the underdog Saints (5-point underdogs) to defeat Peyton Manning’s Indianapolis Colts. The game was a masterclass in strategic gambling; Walters took the Saints straight, and after trailing 10-6 at halftime, New Orleans won outright, 31-17, thanks in large part to the famous onside kick. Walters cleared a profit of over $11.5 million.

When Jim "Mattress Mack" McIngvale puts his money down, it grabs the attention of the entire sports betting industry. In 2022, the Houston furniture mogul turned the betting world on its head by backing the Houston Astros to win the World Series. But he didn't just place a bet; he put together $10 million of action across multiple books like Caesars and WynnBET. When the Astros eventually hoisted the trophy, defeating the Philadelphia Phillies in six games, Mack walked away with a staggering $75 million payout, which proved to be the largest verified victory in legal sports betting history.