Archbishop Mitty, projected to finish last in the West Catholic Athletic League, entered the rankings after a stellar non-league run.
Another WCAL team, St. Ignatius, jumped several spots after going on the road and defeating San Diego powerhouse Cathedral Catholic.
California also made a leap after taking down Monterey Trail-Elk Grove to improve to 3-0.
The top 10 remains mostly unchanged, although Wilcox climbed to No. 10 after routing formerly-ranked Sacred Heart Cathedral at Kezar Stadium in San Francisco.
St. Francis and Archbishop Riordan switched spots after Riordan pushed No. 2 Pittsburg to the brink, and the Lancers were crushed by No. 1 De La Salle.
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On to the rankings …
Bay Area News Group Top 25
(Mercury News & East Bay Times)
No. 1 DE LA SALLE (3-0)
Previous ranking: 1
Last week: Beat St. Francis 42-7
Up next: Friday at St. Mary’s-Stockton, 7:15 p.m.
No. 2 PITTSBURG (3-0)
Previous ranking: 2
Last week: Beat Archbishop Riordan 56-42
Up next: Friday at St. John Bosco-Bellflower, 7 p.m.
No. 3 SERRA (1-2)
Previous ranking: 3
Last week: Lost to St. John Bosco-Bellflower 56-16
Up next: Sept. 27 at St. Ignatius, 7 p.m.
No. 4 ARCHBISHOP RIORDAN (1-2)
Previous ranking: 5
Last week: Lost to Pittsburg 56-42
Up next: Saturday vs. Sacred Heart Cathedral, 1:30 p.m.
No. 5 ST. FRANCIS (2-1)
Previous ranking: 4
Last week: Lost to De La Salle 42-7
Up next: Sept. 27 vs. Bellarmine, 7 p.m.
No. 6 EL CERRITO (2-0)
Previous ranking: 6
Last week: Friday at Oakland Tech, stopped in second quarter
Up next: Friday vs. Campolindo, 7 p.m.
No. 7 SAN RAMON VALLEY (3-0)
Previous ranking: 7
Last week: Beat Clayton Valley Charter 31-15
Up next: Friday at McClymonds, 7 p.m.
No. 8 LOS GATOS (3-0)
Previous ranking: 8
Last week: Beat Live Oak 35-0
Up next: Thursday vs. Mountain View, 7:30 p.m.
No. 9 MCCLYMONDS (1-2)
Previous ranking: 9
Last week: Beat Bishop O’Dowd 28-14
Up next: Friday vs. San Ramon Valley, 7 p.m.
No. 10 WILCOX (2-1)
Previous ranking: 11
Last week: Beat Sacred Heart Cathedral 39-14
Up next: Sept. 28 at Archbishop Riordan, 1:30 p.m.
No. 11 VALLEY CHRISTIAN (1-2)
Previous ranking: 10
Last week: Lost to Soquel 27-10
Up next: Sept. 28 vs. Archbishop Mitty, 6 p.m.
No. 12 LAS LOMAS (3-0)
Previous ranking: 13
Last week: Beat Tamalpais 42-13
Up next: Friday vs. Alhambra, 7 p.m.
No. 13 CALIFORNIA (3-0)
Previous ranking: 17
Last week: Beat Monterey Trail-Elk Grove 35-21
Up next: Friday at Antioch, 7:15 p.m.
No. 14 ST. IGNATIUS (2-1)
Previous ranking: 18
Last week: Beat Cathedral Catholic-San Diego 16-14
Up next: Sept. 27 vs. Serra, 7 p.m.
No. 15 CLAYTON VALLEY CHARTER (1-2)
Previous ranking: 12
Last week: Lost to San Ramon Valley 31-15
Up next: Friday vs. Northgate, 7 p.m.
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No. 16 CAMPOLINDO (1-2)
Previous ranking: 14
Last week: Lost to Windsor 33-14
Up next: Friday at El Cerrito, 7 p.m.
No. 17 LIBERTY (2-1)
Previous ranking: 19
Last week: Beat Tracy 34-21
Up next: Friday at Amador Valley, 7 p.m.
No. 18 BISHOP O’DOWD (2-1)
Previous ranking: 15
Last week: Lost to McClymonds 28-14
Up next: Friday at Cardinal Newman, 7 p.m.
No. 19 MONTE VISTA (2-1)
Previous ranking: 16
Last week: Beat Bellarmine 24-13
Up next: Friday vs. James Logan, 7 p.m.
No. 20 ACALANES (2-1)
Previous ranking: 20
Last week: Lost to Del Oro-Loomis 34-21
Up next: Friday vs. College Park, 7 p.m.
No. 21 ARCHBISHOP MITTY (3-0)
Previous ranking: Not ranked
Last week: Beat Menlo-Atherton 21-0
Up next: Sept. 28 at Valley Christian, 6 p.m.
No. 22 MENLO SCHOOL (3-0)
Previous ranking: 22
Last week: Beat Los Altos 56-6
Up next: Friday at Capuchino, 7 p.m.
No. 23 SANTA TERESA (3-0)
Previous ranking: 23
Last week: Beat Pioneer 41-35, OT
Up next: Friday vs. Hillsdale, 7:15 p.m.
No. 24 SALESIAN (3-0)
Previous ranking: 25
Last week: Beat College Park 26-21
Up next: Saturday vs. Oakland Tech, 1:40 p.m.
No. 25 MENLO-ATHERTON (2-1)
Previous ranking: 21
Last week: Lost to Archbishop Mitty 21-0
Up next: Friday vs. Live Oak, 7 p.m.
Editor’s note: Teams eligible for the Bay Area News Group rankings come from leagues based predominantly in Alameda, Contra Costa, San Mateo and Santa Clara counties. The news organization’s high school staff chooses the teams.