LAS VEGAS — Elgin Cook scored 22 points and No. 8 Oregon survived a wild closing sequence in regulation to beat No. 15 Arizona 95-89 in overtime Friday night in the Pac-12 semifinals.
Oregon (27-6) led by 17 early in the second half, but Arizona (25-8) charged back and tied it in improbable fashion.
Oregon's Chris Boucher missed two free throws with 12 seconds left, and Arizona's Gabe York followed with a 3-pointer after gathering a rebound. Mark Tollefsen stole the inbound pass and was fouled, but hit just 1 of 2 free throws to send the game to overtime.
The Ducks dominated overtime, going up six on 3-pointers by Dwayne Benjamin and Dillon Brooks to earn a spot in Saturday night's championship game against No. 24 California or No. 12 Utah.
Tyler Dorsey had 19 points and Brooks 17 for the Ducks, who had 11 blocked shots and 10 steals.
York had 21 points, and Allonzo Trier added 16 before fouling out late in regulation.
MGM Grand Garden Arena becomes McKale North whenever Arizona is playing in the Pac-12 Tournament, but the Ducks had no trouble winning at the real home of the Wildcats.
Oregon won the only regular-season meeting with Arizona, ending the Wildcats' 49-game home winning streak with an 83-75 victory in Tucson. The Ducks gave the Wildcats fits with their athleticism and ability to expose individual matchups, though Arizona also was missing Trier due to a broken right hand.
Trier was back for the rematch, but the Ducks didn't care.
They flew past the Wildcats early, let them get back in it, then closed the first half with a flourish.
Oregon did it with defense, getting eight blocked shots and six steals to set up its quick-hitting offense. The Ducks closed the half with a 15-2 run, capped by Brooks' buzzer-beating dunk — in transition, of course — to lead 44-29.
Arizona tried to make several runs in the second half, but the Ducks had an answer seemingly every time, usually with a dunk-and-trash-talk combo.
The Wildcats finally put a dent into Oregon's lead behind their defense, using a 10-2 run to pull to 65-60.
The Ducks still seemed to be in control but struggled from the free throw line, missing 6 of 8 in the final 2:48 to set the stage for Arizona's improbable game-tying sequence.
Arizona: Trier fouled out with 2:34 left. ... The Wildcats had a 50-36 advantage rebounding, including 27-14 on the offensive glass.
Oregon: The Ducks are 23-0 when leading or tied at the half. ... Benjamin had 12 points and eight rebounds despite spraining his ankle in the second half.