The Cardinals recalled O'Brien from Triple-A Memphis on Tuesday, Katie Woo of The Athletic reports.
O'Brien made the Cardinals' Opening Day roster but suffered a flexor strain in his first appearance and missed the remainder of the first half. He has pitched well since resurfacing at Memphis, posting a 1.35 ERA and 9:5 K:BB over 13.1 innings, to earn another look with the big club.
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