Liberatore has a 2.38 ERA, 1.15 WHIP and 30:8 K:BB in 22.2 innings over four starts for Triple-A Memphis.
The 6-foot-4 southpaw's fastball ticked up into the mid-90s this spring, and he has used that added velocity to get off to a strong start in a return to Triple-A. Adam Wainwright (groin) is nearing a return to the Cardinals' rotation, but Liberatore won't need much more seasoning before he is ready for another shot in the big leagues if other injuries occur ahead of him on the depth chart.