Cardinals' Riley O'Brien: Acquired by Cardinals

The Cardinals acquired O'Brien from the Mariners on Monday in exchange for cash considerations and purchased his contract, Derrick Goold of the St. Louis Post-Dispatch reports.

O'Brien, 28, posted a dominant 2.29 ERA and 86:31 K:BB over 55 frames this past season at Triple-A Tacoma. He's allowed two runs over 2.1 innings during his brief time at the major-league level, which came over two appearances between 2021 and 2022. O'Brien joins the Cardinals' 40-man roster and should get the chance to compete for a spot in the Opening Day bullpen.