The Pirates acquired Oviedo and infielder Malcom Nunez from the Cardinals on Monday in exchange for left-hander Jose Quintana and right-hander Chris Stratton.
Oviedo has filled a versatile role for the Cardinals, posting a 3.20 ERA, 1.30 WHIP and 26:7 K:BB across 25.1 innings. He should function as a multi-inning reliever in Pittsburgh's bullpen going forward.