Cardinals place LHP Matthew Liberatore (back) on IL

(Photo credit: Jeff Curry-USA TODAY Sports)
The St. Louis Cardinals placed left-hander Matthew Liberatore on the 15-day injured list Tuesday with tightness in his lower back.

The Cardinals called up right-hander Jacob Barnes from Triple-A Memphis in a corresponding transaction.

Liberatore, whose designation is retroactive to Saturday, is 2-5 with a 6.12 ERA in 50 innings over 12 games (11 starts) this season.

Liberator