The Orioles have announced that they’ve placed righty Darren O’Day on the 15-day DL (retroactive to August 12) with a right shoulder rotator cuff strain. To take his place on the active roster, they’ve recalled righty Tyler Wilson from Triple-A Norfolk. The seriousness of the injury isn’t yet known.

[Updated Orioles Depth Chart]

O’Day has been one of the AL’s best relievers in each of the past several seasons, but he hasn’t quite been up to his usual standards this year — he’s issued 4.3 walks per nine innings, more than doubling his 2015 walk rate and contributing to a jump in his ERA from 1.52 to 3.95.  He’s also pitched just 27 1/3 innings, missing most of June and July to a hamstring strain. Nonetheless, he’s maintained a very respectable 10.9 K/9.

The 26-year-old Wilson has pitched 85 innings for the Orioles this season, most of them as a starter, posting a 4.98 ERA, 4.9 K/9 and 2.2 BB/9. The O’s optioned him to the minors last week. There’s been no official word from the Orioles, but it appears they’ll use him as a reliever this time, since the rotation has been healthy and effective lately.

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