Let's take some deep breaths after an active weekend across the country and look at the updated ESPN top 25 rankings heading into Week 4. Football Power Index (FPI) college football rankings and computer prediction model are a measure of team strength that predicts a team’s future performance.

There are three games between top-25 teams facing each other for the first time in-conference. The week is highlighted by a showdown between No. 11 USC and No. 18 Michigan from the Big House. No. 12 Utah visits Stillwater to meet No. 14 Oklahoma State and No. 6 Tennessee will welcome No. 15 Oklahoma to the SEC.

Week 4 in college football boasts several key matchups, including notable conference debuts. A look at the seven games to watch this weekend.