Levi DeVries and Robby Walker each scored three goals, leading Auburn Riverside past Auburn Mountainview 12-6 in a boys water polo match Monday.
Iain Jahns and Justin Pritchard each had two goals for the Ravens.
Lions are the highest seed for the second straight year in the final four.
Local high schools prepare for the state tournament.
Yu shot four under par in round one to push her to a district win.