Grapevine, TX (SportsNetwork.com) - TCU returned to the top four in the College Football Playoff rankings on Tuesday, moving up two spots to No. 3 ahead of reigning national champion Florida State.

Alabama was No. 1 for the third week in a row after beating Auburn in the highest-scoring Iron Bowl in history and Oregon was No. 2 for the fourth week running.

The Crimson Tide (11-1) will face Missouri in Saturday's SEC championship game while the Ducks (11-1) are getting ready for Friday's Pac-12 title game against Arizona, which is No. 7 in this week's poll.

TCU, after routing Texas by 38 points for its sixth consecutive win, returned to the top four for the first time in three weeks with its highest ranking in the poll to date.

The Horned Frogs (10-1) face Iowa State on Saturday in their final regular season game.

After being ranked No. 3 for three weeks in a row, Florida State fell one spot in the poll despite being the only remaining unbeaten FBS team.

The Seminoles (12-0) play Georgia Tech on Saturday for the ACC championship.

Ohio State moved up one spot to No. 5 despite losing Heisman Trophy hopeful J.T. Barrett to a broken ankle during Saturday's win over Michigan, and Baylor was ranked sixth this week.

Ohio State (11-1) faces Wisconsin in the Big Ten Championship Game on Saturday and Baylor (10-1), which beat TCU in October, plays Kansas State.

The selection committee will meet one more time this weekend before announcing the final standings on Sunday.

The top four teams in the final rankings will play in the national semifinals on Jan. 1.

The winners of the Rose Bowl and Sugar Bowl on New Year's Day will move on to the national championship game on Jan. 12 at AT&T Stadium in Arlington, Texas.

The playoff system replaced the oft-criticized BCS, which was in place from 1998 until last season.

Michigan State, Kansas State and former CFP No. 1 Mississippi rounded out the top 10 on Tuesday. Mississippi State tumbled six places from No. 4 last week after losing to Ole Miss.

Georgia Tech, Ole Miss, Wisconsin, Georgia, UCLA, Missouri, Arizona State, Clemson, Auburn, Oklahoma, Louisville, Boise State, Utah, LSU and USC rounded out the top 25.