Six biggest X-factors in CFB Playoff

7College Football Playoff commences

Joshua S. Kelly-USA TODAY Sports

The College Football Playoff commences on Saturday with a semifinal doubleheader. No. 3 Notre Dame and second-ranked Clemson begin the festivities in the Cotton Bowl. Capping the action are Oklahoma and defending champ Alabama.

Some sportsbooks are already penciling in the Tigers and Crimson Tide as the grand finale matchup. However, there are some X-factors at play to consider. Some could lead to the underdog Sooners pulling the upset.

The same goes for the Fighting Irish, though they’ll need that hereditary luck more than Oklahoma will. Below is a closer look at the biggest CFP X-factors.