The odds on the Floyd Mayweather-Conor McGregor fight keep getting closer and closer.

That's not because book makers are getting more bullish on McGregor -- in fact, the pros still think the odds should be around 50-1.

It's because 94 percent of the bets are being placed on the Irishman.

[Related: See which celebs will be at Floyd Mayweather Conor McGregor fight.]

When the fight was still a hypothetical exercise in February, The Westgate Las Vegas Superbook first posted Mayweather as a -2500 favorite (and McGregor a +1100 underdog) Now the consensus price is Mayweather -475 (McGregor +375).

[That means Mayweather is a 4.75 to 1 favorite, down from 25 to 1.]

"This is like hanging -3 on the Super Bowl and seeing the line move to -8," Jay Rood, vice president of MGM Resorts race and sports, told ESPN, revealing his company's current ticket ratio of McGregor bets to Mayweather bets 25-1. Last month it was 50-1. "This could be the worst loss in the history of MGM Resorts."

"Sharps are waiting to hit the Mayweather line when it bottoms out," professional bettor and Yale economics major Rufus Peabody said. "There will be a lot of big-money bets on Mayweather. The question is how much of that will offset the public bets on McGregor."