Mariano Duncan promoted by Mets (source)

The Mets have promoted Mariano Duncan to their coaching staff in the newly created role of Major League coach, according to a person familiar with the plans. Duncan will help the team’s position players in multiple areas, while also serving as a batting-practice pitcher. The club has not confirmed the hire.

With Duncan in the fold, the Mets’ coaching staff will grow by one. The team is…