USC's victory over Arizona moved the Trojans back into the Associated Press media poll on Sunday at No. 22.
USC defeated previously unbeaten and 10th-ranked Arizona, 28-26, Saturday night at Arizona Stadium to improve to 4-2 overall and 3-1 in the Pac-12 Conference.
The Trojans had dropped out of the poll after last week's 38-34 defeat by Arizona State on a last-second Hail Mary touchdown pass.
Mississippi State is ranked No. 1, followed by Florida State, Mississippi, Baylor and Notre Dame.
Arizona dropped to No. 16.