West Linn is the only Oregon team in Sunday's semifinals of the Les Schwab Invitational at Liberty High.
The Lions will face Bishop Gorman of Las Vegas, Nev., at 7:30 p.m. in the first semifinal game as the tourney swings into its third of four days.
Whitney Young of Chicago and Rainier Beach of Seattle will meet at 9 p.m. in the other semifinal.
In other evening match-ups Sunday, Jesuit and Tigard will square off at 4:30 p.m., and Churchill and Jefferson will have a Class 5A title game rematch at 6 p.m. all four teams lost quarterfinal games on Saturday.
Rainier Beach, the nation's No. 9-ranked team, outscored Jefferson 24-8 in the first period in raising its record to 6-0.
Silas Melson of Jeff (5-1) had a game-high 32 points, and Devaunte Paschal added 21 points for the Demos.
Whitney Young beat Churchill 89-80, shooting 64.7 percent from the field and getting 40 points and 16 rebounds from 6-11 Duke-bound center Jahlil Okafor.
Paul White, a 6-9 small forward who has signed with Georgetown, added 28 points for Whitney Young (7-2), which was just 1 of 3 on 3-pointers but piled up a 54-28 edge in points in the paint.
Churchill (4-1) got 32 points from Deshone Brooks, who made 7 of 13 from 3-point range.
West Linn downed Tigard 58-44. The defending Class 6A champion Lions are 5-2, while the Tigers fell to 3-3.
Bishop Gorman opened with an 11-0 run and was never headed as it beat Jesuit 51-36.
The Crusaders fell to 5-3. Jack Nadelhoffer led them with 10 points. Jesuit shot 38.6 percent from the field, going 12 fo 42.
Bishop Gorman improved to 8-3, shooting 52.6 percent.
In Saturday morning's consolation games, Timberline of Lacey, Wash., defeated Beaverton 55-44, Central Catholic stopped South Eugene 62-51, Clackamas downed Sunset 68-60, and Grant beat Lake Oswego 66-60.
Central Catholic jumped on South Eugene with a 16-5 first quarter. The Rams led 40-26 at the half, saw their lead cut to three late in the third quarter, then built it back up.
Central (3-5) shot 53.7 percent from the field, while the Axemen (2-4) made 43.2 percent.
Guard Xavier Hallinan had 17 points for the Rams, and reserve Cole Stringer added 14 points.
Grant (6-1) led the Lakers 21-11 after one quarter and 38-22 at the break.
Alondre Augustus came off the bench with 5-for-8 long-distance shooting and 18 points for the Generals. Dylan Leonard had 13 points, Darren Kennedy 12 and Deiondre Bird seven before fouling out in the fourth quarter.
Guard Jazz Johnson had 35 points for LO (6-2), making 4 of 10 from 3-point range, 9 of 23 from the field and 12 of 14 free throws in 32 minutes.
The consolation semifinals Sunday are Central Catholic-Timberline at 11:30 a.m., and Grant-Clackamas at 1 p.m.
The earlier Sunday games are Beaverton-South Eugene at 8:30 a.m., and Sunset-Lake Oswego at 10 a.m.