Mets' Zach Muckenhirn: Designated for assignment

Muckenhirn was designated for assignment Monday, Will Sammon of The Athletic reports.

Muckenhirn has allowed four runs in six relief innings with the Mets this season. He's spent most of the year at Triple-A Syracuse, where he's posted a 0.88 ERA but with just 19 strikeouts in 30.2 frames.