Mets placed RHP Mike Pelfrey on the 15-day disabled list with a right elbow injury. Pelfrey is getting an MRI on his throwing elbow Tuesday to determine whether there's any structural damage. Mets GM Sandy Alderson told reporters that a ligament tear has not been ruled out. Robert Carson has been promoted from Triple-A Syracuse to take the right-hander's 25-man roster spot, but a rotation replacement has not been decided upon.