LAS VEGAS—Bettors cried foul after most Nevada casinos declared the Philadelphia Phillies the winner of Game 5 of the World Series despite it being suspended while tied in the middle of the sixth inning.

Nevada sports books and gambling regulators received complaints Wednesday from bettors angered by rules governing wagers on the rain-delayed contest. But the disputes vary depending on where the bets were placed because rules are not uniform among casinos across the state.

The flap stems from the circumstances surrounding Monday night’s game, which resumed Wednesday nig...

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