The Ducks were blasted at home 62-20 by Utah on Saturday night. It was the most points ever allowed by the Ducks at Autzen Stadium and gave them two September losses for the first time since 2004.
The top six teams in the AP media poll were the same as last week with Ohio State No. 1, Michigan State No. 2 and Ole Miss No. 3.
TCU dropped from a tie with Ole Miss to fourth after escaping from Texas Tech with a victory. Baylor is fifth and Notre Dame sixth.
Utah surged eight spots to No. 10 after beating the Ducks and received one first-place vote, its first top ballot ever during the regular season.
There were five new teams in the rankings this week, including a couple of traditional powers that had been on an extended hiatus. No. 22 Michigan and No. 25 Florida are ranked for the first time since 2013.
No. 24 Cal is back in the rankings for the first time since 2009, and No. 23 West Virginia is ranked for the first time this season. Mississippi State joined the rankings at No. 21.
Like Oregon, Arizona fell from the rankings after getting routed at home Saturday night. The Wildcats lost 56-30 to UCLA and had quarterback Anu Solomon leave with a possible head injury.
Georgia Tech, Missouri and BYU also fell out.
Pac-12 moves up in latest AP Poll
Both UCLA and Utah make moves and five new teams enter the top 25. Chris Low reacts to the week 5 AP Poll.
Utah steamrolls Oregon for historic loss
Travis Wilson connects for 227 yards and four touchdowns as Utah hands Oregon its worst home loss since 1977 with a 62-20 victory.