The first College Football Playoff ranking of the season has Ohio State debuting at No. 1 for the first time ever in the Playoff era and defending national champion Clemson on the outside looking in at No. 5.

The Buckeyes are followed by No. 2 LSU and No. 3 Alabama, who have been ranked either first or second in the AP Poll for the last four weeks and will face each other in a blockbuster matchup on Saturday in Tuscaloosa.

Penn State rounds out the top four, leapfrogging Clemson -- who was ranked fourth in the AP Poll. The Nittany Lions will face unbeaten No. 17 Minnesota on Saturday. At No. 12, Baylor is the only other undefeated team in the CFP ranking.

No. 6 Georgia leads a pack of one loss teams, followed by No. 7 Oregon, No. 8 Utah and No. 9 Oklahoma. No. 10 Florida, fresh off a close loss to Georgia, is the highest ranked two loss team, followed closely by No. 11 Auburn.

No. 13 Wisconsin, No. 14 Michigan and No. 18 Iowa round things out for the Big Ten.

Notre Dame comes in at No. 15, followed by fellow 6-2 team Kansas State at No. 16. No. 19 Wake Forest joins Clemson as the only other ACC team represented.

The AAC has four teams in the ranking: No. 21 Memphis, No. 23 Boise State, No. 24 Navy and No. 25 SMU.

No. 20 Cincinnati and No. 23 Oklahoma State round out the top 25.

The 13-member committee will produce four more sets of rankings each Tuesday before the only ones that really count come out on selection Sunday, Dec. 8.