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Armstrong will serve as the Rays' opening pitcher for Sunday's game against the Giants, Ryan Bass of Bally Sports Sun reports.
Armstrong isn't expected to work more than an inning or two before turning the game over to Tyler Alexander, who is slated to work as a bulk reliever. Through four appearances (one start) this season, Armstrong has covered 6.1 innings while striking out five and allowing four earned runs on six hits and four walks.
