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 fifth weekend of the 2018 season featured its share of big matchups on Saturday night. In the marquee games for Week 5, Notre Dame defeated Stanford, and Ohio State edged Penn State to remain unbeaten. Alabama remains No. 1 in the top 25, but the Buckeyes jump to No. 2, followed by Georgia at No. 3 and Clemson at No. 4. Syracuse, Florida and NC State join the top 25 after Week 5 action.