Hernandez was optioned to Double-A Jackson on Thursday.
The Diamondbacks made a pair of roster moves to clear a spot for J.J. Hoover, whose contract was selected Thursday. Hernandez fared well this spring, slashing .294/.368/.647 with a pair of home runs, but the Diamondbacks had to cut down on the number of catchers they'll be carrying with Opening Day rapidly approaching. He'll begin the season at Double-A.