Mississippi State, Florida State and Auburn held the top three spots in the second College Football Playoff rankings, with Oregon joining them in the top four Tuesday night.

Marcus Mariota and the Ducks, coming off a 45-16 win over Stanford, moved up one spot from fifth in the initial poll by the 12-member selection committee. They moved in ahead of Alabama, a third team from the West Division of the Southeastern Conference that was also up one place to fifth.

"It was very close, and I think it's the product of Oregon's other wins they have," Arkansas athletic director and selection committee chairman Jeff Long said. "They have the Michigan State win, but they also, again, went on the road against UCLA and won, and a couple of wins that made their body of work, put them a step ahead of (Alabama) at this point."

Mississippi dropped seven spots to 11th after its second consecutive loss, 35-31 to Auburn. The Rebels remained ahead of four one-loss teams from power-five conferences, directly ahead of Baylor, Nebraska and Ohio State -- Nos. 12-14, and all higher than a week ago.

Auburn is the highest ranked of the 12 one-loss teams in the rankings that will ultimately determine the national semifinals, and set matchups for the other four marquee New Year's Day bowls that are part of the playoff rotation.

College Football Playoff Top 10 Oregon moves into the top four of the College Football Playoff rankings while Ole Miss tumbles out of the top 10 altogether.

Rankings | Breakdown | Rank 'em 1. Mississippi St. 6. TCU 2. Florida St. 7. Kansas St. 3. Auburn 8. Michigan St. 4. Oregon 9. Arizona St. 5. Alabama 10. Notre Dame

Mississippi State held on to No. 1 after a 17-10 victory over Arkansas, when the Bulldogs trailed after halftime for the first time this season. Florida State overcame a 21-0 deficit at Louisville and won 42-31.

The Bulldogs and Seminoles are the only remaining undefeated teams from power-five conferences, and Long said "it really wasn't close" to any chance of them flip-flopping in the top two spots.

"We stayed pretty consistent with the way we looked at 1 and 2 with Mississippi State and Florida State," Long said. "Auburn was a little bit behind in No. 3, but they were a solid No. 3."

Marshall, which is 8-0 in Conference USA, again didn't make the Top 25 playoff rankings.

Big 12 leader Kansas State moved up two spots to seventh, hopping over Michigan State, which remained eighth.