No. 6 Ohio State, No. 10 Penn State and No. 14 Oregon returned to The Associated Press college football poll on Sunday, weeks before they start playing, creating a Top 25 as unusual as this season.

At the top of the rankings this week, Clemson remained No. 1 with 55 first-place votes, followed by Alabama at No. 2 with three first-place votes.

The rest of the rankings was rattled by the Big Ten, Pac-12, Mountain West and Mid-American conferences reversing course and deciding to play fall football after initially postponing because of COVID-19 concerns.

None will kick off until late October at the earliest, but the AP decided all FBS teams planning to play in the fall would be eligible for inclusion in the Top 25.

Most voters put the most highly regarded teams from those late-arriving conferences back into their rankings, but not all did. A few stuck with only teams currently playing.

Further complicating voters’ task this week: Two top-10 teams lost to unranked teams at home Saturday. No. 3 Oklahoma blew a big lead and fell to Kansas State. No. 6 and defending national champion LSU was upset by Mississippi State in coach Mike Leach’s debut with the Bulldogs.

Oklahoma slipped to No. 18 and LSU dropped to No. 20. Mississippi State jumped in at No. 16.

Back at the top, Florida moved up two spots to No. 3, Georgia held on at No. 4 and Notre Dame benefitted from the upsets by moving up to No. 5 without playing. As a reminder that this season is anything but normal, the Fighting Irish were idle this weekend because of COVID-19 issues and won’t play next week either.

Then came the Buckeyes, who received four first-place votes. Ohio State is loaded and was a close No. 2 to Clemson in the preseason poll.

Still, 11 voters did not have the Buckeyes on their ballots, deciding to rank only the teams that have played.

No Power Five team has played more than three games so far, but by the time Ohio State is scheduled to play its first game, Clemson might have played five times.

Clemson, Alabama and Georgia were the only teams to hold their spots from last week.

The only big move up for the previously ranked teams was Miami, which jumped four spots to No. 8.

No. 13 Texas A&M will travel to Tuscaloosa to take on No. 2 Alabama next Saturday. The Aggies couldn’t get their offense going against Vanderbilt. It better in Tuscaloosa.

No. 7 Auburn will visit No. 4 Georgia next week. The Bulldogs had their own offensive issues in the opener and Auburn is no Arkansas.