The Portland Pilots beat Seattle 2-0 Saturday night at Merlo Field to earn an NCAA second-round game against Illinois.
Freshman Danica Evans got the winning goal in the 78th minute, senior Amanda Frisbie added an 89th-minute penalty kick, and the defense helped Erin Dees post her 17th career shutout with just one save.
The Pilots (17-2-1) have registered nine shutouts this season.
Seattle's season ended at 17-3-2, and the Western Athletic Conference champions' win streak was snapped at 15.
"Tonight was a great win for the Pilots," Portland coach Garrett Smith said. "Our style of play is well-suited for the playoffs. We're patient, we're deliberate and we're effective, and it was nice to see our seniors and our freshmen step up to create that first goal.
"We played great team defense all night and didn't get rattled."
UP finally broke through when Ellie Boon kept possession and found space for a low cross toward the center of the box, and Micaela Capelle left the ball for Evans.
Frisbie converted the PK after Seattle tackled Capelle inside the box. Frisbie and Capelle are tied for the team lead in goals this season, with eight apiece.
Portland led 11-3 in shots.
The Pilots' next foe, the Illini, eliminated Washington State 3-1 on penalties Saturday after the teams played to a 0-0 draw.
The UP-Illinois game will be Friday in Lincoln, Neb.
Illinois got an at-large berth after going 10-8-3.