College Football Power Rankings: How did the top 25 look in Week 13? - ESPN

What happened in Week 13? We are now down to one undefeated FBS team following No. 5 Indiana's loss to No. 2 Ohio State and No. 19 Army's loss to No. 6 Notre Dame. On top of that, four ranked teams fell to their unranked opponents on Saturday.

With No. 16 Colorado's loss to Kansas and No. 14 BYU falling to No. 21 Arizona State, the Big 12 has a four-way tie at the top of the standings. What does each team have to do next week to reach the conference title game?

After their defense dominated the Hoosiers at Ohio Stadium, the Buckeyes have one more conference matchup left. What do they need to do to meet Oregon in the Big Ten title game?

How did Saturday's action affect our Power Rankings?

Here's the latest top 25 from our college football experts, who provide their insight on each team following Week 13.

Previous ranking: 1

Oregon's second bye week of the year is as good a time as any to recognize not just how the Ducks have gotten to 11-0, but how far the offensive line specifically has come since the first few weeks of the season. In its first two games, Oregon's offensive line gave up seven sacks. Over the past nine games, it has kept quarterback Dillon Gabriel upright, allowing only five sacks total. The improvement began in the Ducks' third game against UCLA, when they shifted Iapani Laloulu to starting center. Lalolulu, a sophomore from Hawaii, has anchored the unit. Per Pro Football Focus, Laloulu has not allowed a sack in 270 pass blocking snaps.

The move and subsequent improvement has both limited the number of sacks and quarterback pressures, but beyond that, it has facilitated the Ducks' running game. In the first two games of the season, they averaged fewer than 3 yards per carry. Since then, they have