By JIM VERTUNO AP Sports Writer
AUSTIN, Texas — The expanded College Football Playoff has a decidedly old-school feel: Smothering defenses have carried the last four teams still in the hunt for the national championship.
If you want offense, look elsewhere this weekend. The defenses, with All-Americans spread throughout the lineups, are the story of the semifinals. Ohio State, Texas, Penn State and Notre Dame all rank among the top eight defenses nationally this season.
The eighth-seeded Buckeyes (12-2) meet the No.