Pirates' Robert Stephenson: Throws bullpen session

Stephenson (elbow) threw a bullpen session Tuesday, according to MLB.com.

Stephenson is slated to throw one more bullpen session before being re-evaluated. Conceivably, he could be ready for a Grapefruit League appearance at that point, which would hopefully give him enough time to get ready for Opening Day. If healthy, Stephenson projects as a primary setup man for Pittsburgh.