The Sun Devils improved to 13-3 and 4-1 in Pac-12 play after defeating the Cougars 68-49.
Forward Sophie Brunner once again led the Sun Devils with another double-double finishing with 20 points and a career-high 15 rebounds.
After only leading 31-30 at halftime, the Sun Devils went on to outscore Washington State 37-19 in the second half as ASU shot 43 percent in the second half.
Arizona State now prepares to face one of the best team in the country in the Washington Huskies.
Washington is ranked No. 8 in the latest AP Poll with their only two losses coming on the road at Notre Dame and Oregon State.