The Bruins, who had a bye last week, rose from No. 11 to No. 9 in Tuesday's latest release of the College Football Playoff rankings.
The new top four is Alabama,
Alabama jumped from fifth to first after a 25-20 win over Mississippi State.
Texas Christian, which held the No. 4 spot last week, fell to No. 5 after a closer-than-expected win over Kansas.
Rounding out the top 10 are Ohio State at No. 6, followed by Baylor, Mississippi, UCLA and Georgia.
USC made its first appearance the rankings, debuting at No. 19 in advance of Saturday's
The Pac-12 has six schools ranked in the top 19, including five from its South Division.