College football’s Week 4 action got a big early start on Friday night in a battle of ranked Big Ten rivals and continued with some more impactful games across the country that could influence how the playoff looks going forward,

Week 4 in college football featured one of the first slates with conference play scattered across the landscape, and the arrival of that portion of the season brings the first real challenges for voters in the AP Top 25 poll.

Here are the five biggest "must-watch" games on the docket for this weekend. While this game may not be the most exciting, Arch Manning is scheduled to make his first start for the Longhorns. That alone makes this game a must-watch on the schedule to see how he can perform.