The two surprise girls' teams of the region will need big surprises on Saturday if they are to continue in the Southern Section playoffs.
Oxnard High (16-11) plays top-seeded Lynwood, one of the top teams in the state, in a Division I-AAA semifinal at Warren High.
Crescenta Valley (18-10), which tied for second place in the Pacific League before upsetting Palmdale and Valencia, hosts top-seeded San Clemente in a Division I-AA quarterfinal.
Buena (27-0), seeded No. 1 in Division I-A and ranked No. 1 in the nation, won a coin flip with Irvine Woodbridge on Thursday and will host a semifinal at Ventura High in the only girls' playoff involving two undefeated teams.
Fourth-seeded Woodbridge (28-0) ousted Saugus in a quarterfinal game.
Third-seeded Harvard-Westlake (24-5), which clinched a state playoff berth Thursday with an overtime victory over Santa Ynez, hosts No. 2 Fullerton Rosary at L.A. Baptist in a Division III-AA semifinal.
In Division IV-AA, No. 2 Oak Park (21-5) meets perennial power Cerritos Valley Christian, seeded third, at Cerritos Whitney.
Flintridge Prep hosts Cate, third-seeded Montclair Prep (24-0) hosts Aquinas and Santa Clara hosts second-seeded Pasadena Poly in Division V-AA quarterfinals.
Third-seeded Oaks Christian (20-7), in its first season and playing with only freshmen and sophomores, will host No. 2 Rolling Hills at Westlake High in a Division V-A semifinal.
In the City Section, Taft (22-1) will travel to top-seeded and defending national champion Narbonne for a Championship semifinal.
Top-seeded El Camino Real (16-7) hosts Garfield and Granada Hills (15-12) travels to No. 2 Marshall in today's City Invitational semifinals.
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GIRLS' BASKETBALL PLAYOFFS
Saturday, 7:30 p.m.
Division I-AAA Semifinal
Oxnard vs. Lynwood at Warren High
Division I-AA Quarterfinal
San Clemente at Crescenta Valley
Division I-A Semifinal
Irvine Woodbridge vs. Buena at Ventura High
Division III-AA Semifinal
Rosary vs. Harv.-Westlake at L.A. Baptist High
Division IV-AA Semifinal
Oak Park vs. Cerritos Valley Chr. at Whitney High
Division V-AA Quarterfinals
Cate at Flintridge Prep
Aquinas at Montclair Prep
Pasadena Poly at Santa Clara
Division V-A Semifinal
Rolling Hills Prep vs. Oaks Chr. at Westlake High
Championship bracket Semifinal
At Southwest College
Taft vs. Narbonne, 2 p.m.