What to watch across the nation in Week 10

College football fans heaved a collective sigh of relief when it was announced that, in 2014, the broken BCS system would be replaced with a four-team national championship playoff.

But, boy, we could sure use it this year.

Five undefeated teams (not counting ineligible Ohio State) remain: No. 1 Alabama, No. 2 Kansas State, No. 3 Notre Dame, No. 4 Oregon and No. 10 Louisville.