The Baltimore Ravens will be without their top wide receiver when they begin the NFL playoffs against the rival Pittsburgh Steelers, as head coach John Harbaugh officially ruled out Zay Flowers with a knee injury Thursday. Flowers did not practice on Tuesday or Wednesday.

It was improbable that the Baltimore Ravens would have their top receiver for Saturday's wild-card game against the Pittsburgh Steelers, but now there's confirmation. Zay Flowers has officially been ruled out for the contest per NFL insider Tom Pelissero.

The Ohio State Buckeyes (12-2) face the Texas Longhorns (13-2) in the Cotton Bowl Friday in a College Football Playoff semifinal. Kickoff from AT&T Stadium in Arlington is scheduled for 7:30 p.m. ET (ESPN).

Notre Dame last won a national championship in 1988. Penn State hasn't been crowned champion of college football since 1986. These blue blood programs are two wins away from a title and meet tonight in the Orange Bowl for the first semifinal of the College Football Playoff.

The Orange Bowl between Penn State and Notre Dame could be a rock fight, and Texas can keep it close against Ohio State in the Cotton Bowl.