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cancelling wrong line bets is explicitly written into almost every online sportsbook's T&C's when you sign up. yes, I've tried it, yes they've cancelled the bets and no, SBR wouldn't have any recourse. be extra careful especially when scalping or arbing different sides of the same game.

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Does the fact it was performed on an exchange rather than at a sportsbook make a difference? I'm fairly certain however that the offered lines was from the book itself and not another trader.