Amanda Nunes enters her UFC 250 main event against Felicia Spencer as an overwhelming favorite at -600 (bet $600 to win $100) at William Hill U.S. sportsbook in Las Vegas.
That didn't scare off one better from placing a $1 million bet on the reigning featherweight champion.
William Hill told ESPN's Ben Fawkes it's the largest bet it has taken on an MMA event. A win would net the undisclosed better $166,666.70.
After taking the bet, William Hill moved Nunes to -650 and Spencer to +450.
If Nunes is able to pull off the victory—as bookmakers predict—she'll become the first UFC fighter to defend titles in multiple weight classes.