Blackburn was designated for assignment by Oakland on Tuesday.

Blackburn made just a single start last season, allowing seven of the 14 batters he faced to score while recording just seven outs. With a career 5.69 ERA and a very low 11.9 percent strikeout rate, he's unlikely to generate much interest on the waiver wire. The move clears space on the 40-man roster for Oakland to add Mitch Moreland.

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