The Cubs on Friday claimed left-hander C.J. Riefenhauser off waivers from the Orioles, while designating lefty Edgar Olmos for assignment to make room on the 40-man roster.
Riefenhauser, 26, has spent parts of the past two seasons in the Majors with the Rays, going 1-0 with a 6.30 ERA in 24 appearances. He posted a 2.86 ERA in 29 appearances for Triple-A Durham in 2015, fanning 34 batters in 34 2/3 innings while walking only seven.
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Riefenhauser was originally selected by Tampa Bay in the 20th round of the 2010 Draft.