The Orioles recalled Hiraldo from Triple-A Norfolk on Saturday.
The Orioles have an open spot on their pitching staff after sending Dean Kremer to Minnesota on Friday, so they'll bring up Hiraldo to add extra bullpen depth until a fifth starter is needed. Hiraldo gave up four earned runs in 1.2 innings across three appearances with the Orioles back in March before landing on the IL with a shoulder injury. He's given up just one run in 8.1 Triple-A innings since then.