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Knizner's contract was purchased from Triple-A Memphis on Friday.

He should spend at least a brief period on the big-league roster while Yadier Molina is out with a thumb injury. Knizner projects as the Cardinals' future starter behind the plate and owns a solid .286/.355/.450 line for Memphis this season, though he may not be able to unseat Matt Wieters for a temporary starting role.

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