Allonzo Trier scored a season-high 25 points, including four three-pointers, and No. 4 Arizona beat USC, 90-77, on Thursday night to stay alone atop the Pac-12 and set up a Saturday showdown against No. 5 UCLA.
Rawle Alkins added 12 points and Lauri Markkanen had 11 for the Wildcats (26-3, 15-1) in Arizona's 21st consecutive home win.
Bennie Boatwright scored 23 points and Chimezie Metu had 15 for the Trojans (22-7, 8-7), who lost their third in a row — to the top three teams in the conference (Arizona, Oregon and UCLA).
The Wildcats closed the first half with a 12-2 run and were up by as many as 16 points in the second half.
Arizona made 11...