Dejounte Murray scored 25 points for the Huskies (11-4, 3-0 Pac-12), who remain alone in first place.
Ike Iroegbu led Washington State (9-6, 1-2) with a career-high 28 points. Josh Hawkinson added 21 points and a career-high 20 rebounds. Hawkinson's 10th consecutive double-double broke the school record he shared with Steve Puidokas, who set the record in 1975-76.
Hawkinson pressured Andrews into missing a jump shot near the free-throw line as time expired at the end of regulation. Washington outscored Washington State 12-8 in overtime, when the Cougars missed three of five free throws in the final 2:27.
Noah Dickerson, one of four Huskies (and three starters) who fouled out, finished with 16 points. Malik Dime added 14.
Charles Callison scored 14 points for the Cougars.
Washington State had a 49-43 lead at halftime. The fast-paced game slowed in the final seven minutes of the half because of a steady stream of fouls and free throws.
Murray, one of four freshmen in Washington's starting lineup, scored 13 of the Huskies' 17 points in the first seven minutes. Iroegbu, who scored a season-low four points against UCLA in Washington State's previous game, scored 12 of the Cougars' 21 points in the first 10 minutes. Murray and Iroegbu both finished with 16 points in the half.
Gary Payton II leads Oregon State past California, 77-71
Gary Payton II had 20 points, 11 rebounds, eight assists and four steals as Oregon State hung on to beat California 77-71 Saturday night.
Tres Tinkle scored 15 points and Stephen Thompson Jr. added 11 points for the Beavers (11-3, 2-1 Pac-12), who broke a five-game losing streak to Cal.
Jaylen Brown had 20 points and seven rebounds, Tyrone Wallace added 17 points and Jordan Mathews had 16 points, including four 3-pointers, for the Golden Bears (12-5, 2-2).
Mathews hit a 3-pointer with 1:49 left to make the score 71-68. Tinkle responded for the Beavers with a rainbow jumper from the corner, behind the basket. Mathews hit another three with 1:01 remaining and the Golden Bears trailed 73-71.
With 30 seconds left, however, Payton made a jumper, was fouled, and sunk the free throw, putting Oregon State up 76-71.
Mathews missed his first 3-pointer with 16 seconds left.