 Reds fans can hit the MLB Grand Slam jackpot at BetMGM. Simply place a bet on any player to hit a home run during the weekend. If he slugs a Grand Slam, you'll win a share of $50,000 in bonus bets. Go to your BetMGM account, place a home run prop bet, and if it's a dinger with the bases loaded, you'll hit the jackpot or split the bonus bets with any other winners. BetMGM and GameSense remind you to play responsibly. 21 plus and present in Ohio. Gambling problem? Call 1-800-GAMBLE in partnership with MGM Northfield Park.