Jim “Mattress Mack” McIngvale lost $13 million in bets on the Astros to win the 2019 World Series and won $12.2 million on Kansas to win the 2022 NCAA men’s basketball title.
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BetMGM confirmed that a bettor turned a free $500 bet into a $269,000 win on a three-team futures parlay that cashed when the Colorado Avalanche won the Stanley Cup Final.