SANTA CLARA, Calif.—Kyle Shanahan was a teenager watching on the sideline when the heated playoff rivalry between the Dallas Cowboys and San Francisco 49ers reached a fever pitch with three straight NFC title game matchups.
Now Shanahan will take a starring role when one of the NFL’s great rivalries resumes as head coach of the 49ers instead of son of their offensive coordinator when San Francisco visits Dallas on Sunday in a wild-card matchup.
