As the final Strikeforce women's bantamweight champion, Rousey was awarded the UFC title prior to this fight and will defend it at the Honda Center in Anaheim on Saturday.
The main event isn't the only big fight on the solid UFC 157 fight card, though.
Lyoto Machida and Dan Henderson will battle for a light heavyweight title shot. The winner of the bout between those top 205-pound contenders will be next in line to meet the winner of a championship fight between champion Jon Jones and Chael Sonnen.
Here is how MMA fans can tune in to watch every portion of the UFC 157 fight card.
YouTube Prelims—6:30 p.m. ET
Kenny Robertson vs. Brock Jardine
Jon Manley vs. Neil Magny
Nah-Shon Burrell vs. Yuri Villefort
FX Prelims—8 p.m. ET
Sam Stout vs. Caros Fodor
Dennis Bermudez vs. Matt Grice
Michael Chiesa vs. Anton Kuivanen
Brendan Schaub vs. Lavar Johnson
Contact your cable provider for more information on how to watch FX on your television.
UFC 157 Pay-Per-View—10 p.m. ET
Josh Koscheck vs. Robbie Lawler
Court McGee vs. Josh Neer
Urijah Faber vs. Ivan Menjivar
Lyoto Machida vs. Dan Henderson
Ronda Rousey vs. Liz Carmouche