What happened: The Cardinals have selected the contract of left-hander Jared Shuster from Triple-A Memphis. To make room on the active roster, the club designated fellow left-hander Bruce Zimmermann for assignment.

Why it matters: Zimmermann was utilized earlier on Tuesday to The out-of-options reliever was immediately removed from the roster to provide a fresh arm for the nightcap.

What to watch: Shuster will be available to pitch out of the bullpen immediately. Zimmermann now faces a stint on the waiver wire to determine his next destination.