Bookmakers are reporting large bets coming in for McGregor, which are improving his odds. For example, a Nevada bet was placed for $150,000 for McGregor to win. McGregor is now running at a low of +375 while Mayweather’s favorite status has dipped to -550 (84% win probability). When odds opened for the fight, Mayweather was widely available as a -2250 favorite, which implies a win probability of 96 percent over +950 underdog McGregor. At those initial lines, a $100 winning bet on Mayweather would receive a $4.44 payoff; a $100 bet on McGregor, meanwhile, would have a payoff of $950. Reports indicate that many bets in McGregor’s favor are being placed by casual betters:
At Caesars Palace sportsbooks, 140 of the first 144 bets were on McGregor, who was paying back around 5-1. Almost all of the early action was small and placed by recreational bettors. One sportsbook manager described it as ‘square-a-palooza.’
A bettor in Nevada placed $150,000 today on Conor McGregor to beat Floyd at a @WilliamHillUS sports book. If Conor wins, he'll net $662,500.
— Darren Rovell (@darrenrovell) July 24, 2017