Allonzo Trier scored 22 points, Dusan Ristic had 15 points and 11 rebounds, and No. 15 Arizona used a big second-half run to roll over Colorado 83-67 on Thursday in the Pac-12 quarterfinals.
Arizona (25-7) wasn't exactly crisp on offense and Pac-12 player of the year Deandre Ayton had a rare quiet day. The Wildcats made up for it with scrappiness, earning a spot in the semifinals Friday against the Stanford- and UCLA winner.
Ayton missed numerous shots he typically makes, fouling out after scoring 10 points on 4-of-14 shooting and grabbing six rebounds.
Colorado (17-15) managed to hang with the Wildcats well into the second half despite play a tough opening-round game the day before. The Buffaloes suffered a huge blow with about 13 minutes left, when point guard McKinley Wright IV went down with a right ankle injury. Arizona reeled off 14 straight points and the Buffaloes never recovered.
George King had 19 points, and Lucas Siewart 16 for Colorado.
UCLA 88, Stanford 77
USC 61, Oregon State 48