The Alabama Crimson Tide head into the postseason with a chance to become the third wire-to-wire champion in the history of The Associated Press college football poll.
The College Football Playoff pairings were to be released later Sunday.
Penn State was fifth, followed by Michigan, Oklahoma and Wisconsin.
The Crimson Tide enter the postseason looking to win back-to-back championships and to join Florida State in 1999 and Southern California in 2004 as the only teams to be AP No. 1 from start to finish.
Alabama would be the 12th team to win two straight AP championships.