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The Athletics placed Blackburn on the 15-day injured list Monday with a stress reaction of the fifth metatarsal of his right foot.
He'll be in a walking boot for at least two weeks, per Martin Gallegos of MLB.com, so Blackburn is set tio require more than a minimum-length stay on the IL. Blackburn had been in line to start Thursday in Houston but will now need to be replaced in the rotation, with recent Triple-A Las Vegas call-up Joey Estes making sense as an alternative.
