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The Cardinals designated Armstrong for assignment Tuesday, Katie Woo of The Athletic reports.
Armstrong was acquired from the Rays in the Dylan Carlson trade and has pitched well with a 2.84 ERA and 12:2 K:BB over 12.2 innings. The Cardinals are likely hoping the right-hander gets claimed so they can clear a bit of salary. Riley O'Brien will replace Armstrong on the roster and in the bullpen.
