Only two FBS teams remain undefeated going into championship week:

No. 1 Clemson (12-0)

Clemson had to hold on to dispose of arch-rival South Carolina, but a win is a win. And, the Tigers have 12.

Outlook: North Carolina looked tough against NC State in the last week of the regular season; so, perhaps the Tigers' path to the playoff isn't as clear as we thought. All questions will be answered in Charlotte.

No. 5 Iowa (12-0)

Nebraska gave Iowa its best shot, but that wasn't enough to knock the Hawkeyes from the ranks of the unbeaten.

Outlook: With Michigan State awaiting them in the Big Ten Championship game, this is Iowa's time to prove that 12-0 isn't a fluke. But, Sparty is definitely the toughest challenge they've faced so far.