These two teams only faced once in the regular season, with UCLA upsetting Arizona in Tucson back in February.
Arizona beat Colorado on Thursday to reach the semifinals, while UCLA knocked off Stanford.
KenPom gives the Wildcats a 59 percent chance of beating the Bruins on Friday, with a projected score of 82-79.
Here is how you can tune into the action.
How to watch
Game time: 7 p.m. MST/6 p.m. PT
TV channel: Pac-12 Networks
Live stream: Pac-12.com/live
Announcers: Ted Robinson (play-by-play), Bill Walton (analyst), and Ashley Adamson (reporter)
How to listen
Online radio stream: Arizona IMG Radio Network
Satellite Radio: Sirius 126, XM 198
Local Tucson radio: 1290 AM and 107.5 FM
Phoenix radio: KGME 910 AM