Anyone know who Scherzer is?

Tommy was at Dick’s and saw this shirt.  Does anyone know who Scherzer is?  I went to and there is no mention of the guy.

Also this shirt is black. Why would Mets merch be black? My guess it is a custom t-shirt from 20 years ago and whoever Scherzer was he threw it away because Mets-wear should not be black. Why Dicks is selling used t-shirts is beyond me.