If you missed it last night, sources say Cardinals plan to promote Double-A pitcher Trevor Rosenthal to big league bullpen today.— B.J. Rains (@BJRains) July 16, 2012
Rosenthal is likely seen as a starting pitcher in the long-term, but it's not uncommon for teams to use prospects as high-impact relievers out of the bullpen. In February, ESPN's Keith Law ranked Rosenthal as the team's No. 7 overall prospect and fifth best pitching prospect.
Rosenthal, a native of Lee's Summit, Mo., has a 2.78 ERA and 1.10 WHIP in 17 starts in Double-A this season. He's struck out 83 batters in 94 innings, though his strikeout rate might tick up a bit as he maximizes his stamina coming out of the bullpen.