Pittsburgh just lost some pitching depth, announcing that right-hander Brandon Cumpton underwent season-ending Tommy John elbow surgery.
Cumpton debuted with the Pirates in 2013 and threw 70 innings for them last season, posting a 4.89 ERA and 46/18 K/BB ratio split between the rotation and the bullpen as a 25-year-old.
He was competing for a long reliever gig this spring while serving as rotation insurance and will likely be out until early 2016.