Dorsey (11-1) at Narbonne (9-3), 7 p.m. This City Section Division I semifinal comes down to whether Dorsey's stingy defense can stop Narbonne's high-scoring offense. Narbonne quarterback Troy Williams has passed for 2,882 yards and 30 touchdowns and run for nine touchdowns. Dorsey's defense has quickness and doesn't let quarterbacks beat it. The Dons' offense has also picked up momentum in the playoffs behind receiver Jaydon Mickens. Avoiding turnovers is the key to victory. The pick: Narbonne.
Carson (7-5) at San Pedro (12-0), 7 p.m. It's rematch time. Carson lost to San Pedro, 21-0, in the Marine League. The Colts are better physically since the last meeting and have turned to a punishing rushing game led by Roger Jones. San Pedro quarterback Kenny Potter is producing Tim Tebow-like performances running, passing and leading. The pick: San Pedro.
Santa Margarita (10-2) at Mission Viejo (10-2), 7:30 p.m. FS West: The Pac-5 Division semifinals are about finding a way to win, and these two rivals are going to engage in a memorable struggle in the trenches. Both are run-first teams relying on powerful offensive lines. Mission Viejo finally has a healthy Buzzy Yokoyama, who has rushed for 160 and 151 yards in the last two playoff games. Santa Margarita has come to rely on junior quarterback Johnny Stanton. The pick: Santa Margarita.
Tesoro (8-4) vs. San Clemente (11-1) at Orange Coast College, 7:30 p.m. FoxSportsWest.com: Tesoro's upset of No. 1 Servite last week was no fluke. This is an improving, dangerous team with young players who are no longer young. Junior Chazz Roberts has been playing well on the defensive line, long with linebacker Blake Rodgers. San Clemente has its own dominant offensive line, led by Kyle Murphy, and a veteran quarterback in Travis Wilson. The pick: San Clemente.
Upland (12-0) at Vista Murrieta (7-5), 7:30 p.m. FoxSportsWest.com: Vista Murrieta hasn't lost on the field. The Broncos rely on a defense that makes lots of sacks and can move the ball on offense behind the versatile Su'a Cravens. Upland's offense is one of the best in its ability to run or pass behind running back Donta Abron Jr. and receiver Kenny Lawler. This is an Inland Division semifinal. The pick: Upland.
— Eric Sondheimer