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Kyle McPherson has been placed on the Triple-A DL, and Tim Alderson will take his place on the Indianapolis roster.
The nature of McPherson's injury isn't yet clear, but he's certainly pitched like he's been hurt so far this year. He has had shoulder problems in the past. Clearly, this is another blow to the Pirates' pitching depth, and a team that's already dealing with injuries to Wandy Rodriguez, Jeff Karstens and Francisco Liriano doesn't need that.