Pirates starter Jeff Karstens felt pain in his right shoulder during his throwing program today. As a result, the Pirates have shut him down, per the Pittsburgh Tribune-Review’s Travis Sawchik. Karstens has not thrown a pitch this season due to the shoulder injury, but was expected to return in early June.
Karstens finished 2012 with a 3.97 ERA, but continues to find ways to miss time. Since 2010, he has missed 88 games and counting due to his right shoulder.