The first Hispanic player in major league baseball is Esteban Enrique Bellan. The 21-year old Cuban infielder plays for the Troy Haymakers of the National Association.

This Day In Baseball

On May 9, 1871 — The first Hispanic player in major league baseball is Esteban Enrique Bellan. The 21-year old Cuban infielder plays for the Troy Haymakers of the National Association.

Source:
Baseball Reference May 9