Ethan Miller/Getty Images Just hours before Floyd Mayweather and Conor McGregor finally enter the ring and face off, the odds on the fight are still moving rapidly, and not in the direction the sportsbooks expected. Going into the weekend, the closest thing to a consensus number you could find on the fight was Floyd Mayweather -550 (bet $550 to win $100) / Conor McGregor +400 (bet $100 to win $400).