Oviedo was recalled from Triple-A Memphis on Friday.
Oviedo failed to earn a spot on the Cardinals' Opening Day roster this year, but he's been working as a starter in Memphis and has posted a 5.58 ERA and 1.32 WHIP in 50 innings over 10 starts. He's served mainly as a starter in the majors and seems like a candidate to draw a start in one of the two games during Saturday's doubleheader against the Cubs.