Ohio State edged past Clemson to No. 3 in The Associated Press college football poll and Wisconsin dropped to 13th after being upset ahead of its showdown with the Buckeyes. Alabama remained No. 1 on Sunday in the AP Top 25 presented by Regions Bank, receiving 24 first-place votes. No. 2 LSU held its place and received 16 first-place votes. The Buckeyes had 13 first-place votes and No. 4 Clemson, the preseason No. 1 team and defending national champion, received nine.

The point margin between the No. 1 and No. 4 in this week’s Top 25 is 78, the smallest it has been this season. Alabama received 1,486 points while LSU had 1,462, Ohio State had 1,429 and Clemson had 1,408.

Oklahoma remained No. 5, but Penn State moved up to sixth after Wisconsin’s first loss of the season. The Badgers were beaten Saturday by 30-point underdog Illinois in the season’s most significant upset so far. Florida, Notre Dame, Auburn and Georgia round out the top 10.