It's one of college football's mile markers. If Oklahoma and Texas are playing, it must be early October, conference play must be fully underway and it must be time to start getting serious. And when both the Sooners and Longhorns arrive in Dallas unbeaten -- as they are this year for the first time since 2011 -- it's time to get really serious.
A particularly big Red River Rivalry headlines Week 6, but in a season that is picking up momentum by the week, there's a lot more than just OU-Texas to track. Only a touchdown separates the top 13 teams in the SP+ rankings, and there's still room for a number of fun upstart stories.