Mets' Zach Muckenhirn: Sent back to Syracuse

Muckenhirn was optioned to Triple-A Syracuse on Saturday, Bob Nightengale of USA Today reports.

Muckenhirn was called up Friday but was knocked around by the Pirates that same night, giving up three runs on six hits across 2.1 innings of relief. Josh Walker was called up to take his place in the bullpen.