The No. 21 Cougars beat the Utes 1-0 for their 10th win of the season.
The Cougars will face Utah Friday, at 3 p.m. PT, and Colorado Sunday, at noon PT.
WSU scored four goals in front of 1,305 fans Sunday, to beat the Bruins 4-2.
No. 20 WSU dropped just its second contest of the season and first Pac-12 match.
The Cougars will host USC, Thursday, at 7 p.m. and UCLA, Sunday, at 11 a.m.
Senior Kourtney Guetlein netted a brace to give WSU its conference-opening win.
Washington State will face Arizona State, Sunday, Sept. 27, in Tempe, Ariz., at 11 a.m.
The Cougars lost, 2-0, in their final nonconference match of the season.
WSU defeated Gonzaga, 3-0, Thursday, for its seventh-straight win.
The Cougars welcome Gonzaga, Thursday, before traveling to Portland, Sunday.
Senior Kourtney Guetlein netted the game-winner in the second overtime to give the Cougars a 2-1 win.
Senior Cara Wegner chipped Oklahoma State's keeper in the 88th minute to give WSU a 2-1 win.