Weekly college football top 25 rankings are a big part of every season, and Athlon Sports will update its top 25 following the games each weekend. The 13th weekend of the 2018 season was headlined by rivalry games, including Ohio State's dominant victory over Michigan. The Buckeyes jump to No. 5 in this week's rankings, just behind Alabama, Clemson, Notre Dame and Georgia. Oklahoma checks in at No.