WHAT TO KNOW

What’s at stake

One of the biggest games in Arizona Stadium’s recent history features two undefeated, top-20 teams hoping to take control of the Pac-12 South. The Bruins have won all three games since Jim Mora took over at UCLA and Rich Rodriguez began coaching at Arizona.

UCLA: QB Josh Rosen. He was stellar in his first game, but looked like a true freshman at times against BYU last week, throwing three interceptions. How he handles the environment

Key matchup

UCLA’s run defense vs. Arizona RB Nick Wilson. Wilson leads the Pac-12 and is sixth nationally with 434 yards and Arizona is seventh nationally after setting a school record with 499 yards rushing against Northern Arizona last week. UCLA is allowing 146 yards rushing per game and will be without star LB Myles Jack, who suffered a season-ending knee injury in practice on Tuesday.

Players to watch

at what should be a rowdy Arizona Stadium will be a big key for the Bruins.

Arizona: LB Scooby Wright. The All-American had surgery to repair torn meniscus in his left knee after being injured in Arizona’s opener and was expected to miss up to a month. He returned to practice ahead of schedule this week and the Wildcats are hoping to have their defensive leader back for Saturday’s game.

Facts & figures

UCLA has cracked the top 10 in the AP Top 25 for the third straight season. ... Arizona set a school record with 792 yards of total offense in its 77-13 win over Northern Arizona last week. The Wildcats are sixth nationally in total offense, averaging 584.7 yards per game. ... The Bruins have won a school-record 11 straight games away from the Rose Bowl. Their last road loss was to Oregon in 2013. ... The Wildcats are 4-13-1 all-time against ranked UCLA teams. ... UCLA’s Paul Perkins ran for 219 yards against BYU last week.

Betting line

UCLA by 3