Annie Brouwer scored 17 points and Stormee Van Belle grabbed 12 rebounds as the Knights opened the game on an 18-4 run and held on to beat the Eagles in 1B action at the Spokane Arena.
St. John-Endicott showed some life in the final three quarters, but the Eagles couldn't climb out of the hole they dug themselves in the first.
Kara Den Hoed added 11 points for the Knights. St. John-Endicott was led by Emily Jones' nine points and five rebounds.
Sunnyside Christian will play Pateros tomorrow, with the winner advancing to the state title game. St. John-Endicott will play Yakima Nation in a loser-out game.
S. Bailey 2, Siegel 0, Porubek 3, Gfeller 7, Dickerson 5, Van Lith 4, A. Bailey 0, Bafus 7, Jones 9.
Williams 3, Brouwer 17, Den Hoed 11, Banks 4, Broersma 6, Van Belle 7, Dalrymple 4.