The first College Football Playoff ranking of the season has Ohio State debuting at No. 1 and defending national champion Clemson on the outside looking in.
It's Ohio State's first No. 1 ranking in the CFP era (since 2014).
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 past four weeks and will face each other in a blockbuster matchup Saturday in Tuscaloosa.
Penn State rounds out the top four, leapfrogging No. 5 Clemson -- which was ranked fourth in the AP poll. The Nittany Lions, in the top four for the first time in school history, will face unbeaten No. 17 Minnesota on Saturday.
At No. 12, Baylor is the only other undefeated team in the CFP ranking.
No. 10 Florida, fresh off a close loss to Georgia, is the highest-ranked two-loss team and only the third to be ranked in the top 10 in the initial rankings. The Gators are followed closely by No. 11 Auburn.