PULLMAN - Derrick Williams scored 17 points and grabbed 19 rebounds as Arizona edged Washington State, 65-63, on Saturday night.
Lamont Jones added 11 points for Arizona (16-4 overall, 5-2 Pacific-10 Conference), which used a big rebounding advantage to overcome poor shooting.
The outcome moved the Wildcats into a tie for second place in the Pac-10.
DeAngelo Casto scored 17 points to go with six rebounds and four blocks for WSU (14-6, 4-4).
Klay Thompson, the leading scorer in the conference, was held to nine points — 13 below his average. He added eight rebounds and seven assists.
The Cougars had a chance to tie or take the lead after Kyle Fogg missed two free throws with 16 seconds remaining.
Faisal Aden grabbed the rebound but, after the Cougars drove the length of the court, Thompson missed a shot with 5 seconds remaining.