Bookies lose big if Conor wins

LAS VEGAS - Conor McGregor is making a lot of wise guys nervous in this gambling city.

Should the Irish mixed martial arts star somehow manage to knock out boxer Floyd Mayweather in the early rounds of Saturday night's super lightweight bout, the city's bookmakers would lose millions of dollars in the biggest single event loss in the history of sports betting.

McGregor fans have flooded sports books with $100 bills backing the MMA fighter, and even a late surge of money on Mayweather might not be enough to balance the books.