SI’s UFC Betting & Fantasy Analyst Casey Olson goes through his predictions and best bets for UFC 250; featuring Amanda Nunes vs. Felicia Spencer in the main event.

The UFC heads back to Las Vegas this weekend for UFC 250: Nunes vs Spencer. Amanda Nunes (19-4-0), the women’s pound-for-pound best fighter, looks to defend her featherweight title against former Invicta Fighting champion Felicia Spencer (8-1-0). Nunes enters the match as a a massive favorite at -525.

Since joining the UFC, in about a year’s time, Spencer has established herself as a game challenger, winning twice via finish, and making a name for herself as she took everything Cyborg Santos could throw at her before eventually dropping a decision. Can Spencer shock the world Saturday night by taking down the champ? We’ll find out soon.

Co-headlining the event will be two of the bantamweight’s best, as No. 9 Cody Garbrandt (11-3-0) makes