The Riviera has a daily slot tournament called "Slot Frenzy".
Each day, beginning at 10am, guests are invited to compete with each other on the "race against time" Slot Frenzy machines. $10 entry fee, gives you 2 1/2 min. of play. At 7pm the top 3 highest scores could walk away with a cash prize. 1st place $250, 2nd place $100, 3rd $50.