My initial reaction was Tiger was the winner, for wagering purposes, but I wanted to see what other books were doing. As far as I know, most left the bet. And you can use some other sports for precedent. A few months back when an MMA fighter got busted for steroids (I think) and the striped him of wins, they didn't change those bets....though people tried. If a baseball game, they finish the game after 7 full innings (for whatever reason) the team leading is the winner for wagering purposes. If they now come back and finish out the 2 innings and the other team wins it, the original winner stands.