Mattson's contract was purchased by the Orioles on Friday, Joe Trezza of MLB.com reports.

One of the pitching prospects that Baltimore received from the Angels in last offseason's Dylan Bundy trade, Mattson spent the summer at the alternate training site. He is a relief pitcher and struck out 19 in 9.1 innings at Triple-A in 2019, so he could eventually work in high-leverage situations.

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