Terrence Ross had 21 points and 13 rebounds on Sunday to lead Washington to a 75-72 win over Oregon State.
C.J. Wilcox added 17 points for the Huskies (17-8, 10-3), who went back into a tie for first place in the Pac-12 with California, which won at UCLA on Saturday.
Jared Cunningham had 23 points and seven rebounds for Oregon State (15-10, 5-8).
Washington took the lead for good at 61-58 on Abdul Gaddy's 3-pointer with 4:58 left. Tony Wroten grabbed an offensive rebound and scored with 4:02 remaining to put the Huskies up five.
A 3-pointer by Oregon State's Ahmad Starks with 2:10 left made it 65-63 and another with 22 seconds to go to get the Beavers within 70-68.
Washington's Desmond Simmons made two free three throws, and teammate Terrence Ross added two more with 10 seconds left.