The wager, a 13,115-1 long shot, comprised three same-game parlays on the NBA playoffs and three money lines on the NHL and NBA playoffs.
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The Celtics are the 3-1 favorites at Station Casinos sportsbooks to win the NBA championship, and the Bruins are the 3-1 favorites to win the Stanley Cup.
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.