On Senior Night, Seton Catholic notched its program-best 15th win of the season behind 23 points from Delano Morgan.
Xavian Rushing added 11 points and Andrew Olson had 10 for the Cougars, who will open district next week against Montesano.
Stevenson will face Castle Rock on Monday at King’s Way Christian to decide the Trico League’s final berth to the district tournament.
SETON CATHOLIC 83, STEVENSON 60
STEVENSON — Brady Hall 6, Jesse Miller 7, Jono Blackledge 7, Lincoln Krog 15, Charles Hobbs 3, Alec VanPelt 0, Connor Blair 1, Isaac Hoidal 16, Willy Lanz 5, Nolan Boucher 0, Bennett Wright 0. Totals 20 (7) 13-27 60.