Nigel Williams-Goss added 20 points and six assists for the Huskies (15-11, 4-10 Pac-12), who snapped a seven-game losing streak.
Curtis High School product DaVonte Lacy led Washington State (11-15, 5-9) with 23 points. Shoreline’s Josh Hawkinson had 17 points and 14 rebounds, Que Johnson scored a season-high 16 points off the bench and Jordan Railey contributed 10 points.
The Cougars led 41-37 at the half. No more than three points separated the teams most of the second half.
Washington has defeated WSU in eight of the past 10 meetings, but seven of the past eight games have been decided by five points or less.
A desperation heave from midcourt by Johnson fell short at the final horn. Johnson tied the game at 84-84 by hitting two free throws with 36.7 seconds left.