Knizner will open the season as the Cardinals' backup catcher, Derrick Goold of the St. Louis Post-Dispatch reports.
Knizner has gone just 4-for-42 (.095) through 14 games this spring in the Grapefruit League, but he still managed to fend off a challenge from Tres Barrera. It probably came down to experience in the end, as Knizner was the locked-in backup to Yadier Molina the last two years. He'll now fill the same role behind offseason addition Willson Contreras.