Marlins prospect José Castro set a Dominican Summer League single-season record with 16 home runs, but his favorite swing of the year wasn’t one of those.

That honor goes to Castro’s walk-off homer in an intrasquad game, which secured bragging rights in a competitive setting the organization views as a fun and effective way to develop its players.

“It was a very exciting moment for me,” Castro said via interpreter Luis Dorante Jr. “A lot of fun. It was great.”

So who exactly is Castro?

The 18-year-old is a native of San Antonio de Guerra, a municipality in the Santo Domingo province of the Dominican Republic. Castro aspired to be like Winter League role model Emilio Bonifacio -- a former Marlin -- and Mets slugger Juan Soto. An older cousin of his even competed in the Dodgers’ syst

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