SAN FRANCISCO -- The D-backs will move Opening Day starter Josh Collmenter to the bullpen and replace him in the rotation with right-hander Allen Webster, who will start Saturday against the Giants. The corresponding roster move will be announced before the game.
Collmenter has been struggling of late. He has not won a game since May 6 and has a 7.76 ERA over that span.
D-backs manager Chip Hale explained the decision by saying that Collmenter has struggled with command and velocity of late and that a move to the bullpen might help him. Collmenter was a valuable reliever for the D-backs in 2012 and '13 before being shifted back to the rotation last season.