Castro will start a bullpen game for the Mets on Tuesday against the Cardinals.

Jacob deGrom was a late scratch due to side tightness, so it will be all hands on deck out of the Mets' bullpen. This will be Castro's first start since July 15, 2018, and his season high is 1.2 innings back on April 13, so it's highly unlikely he logs more than a couple frames.

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