Jorge Alfaro is the undisputed starter for the 2020 Miami Marlins at backstop, but being a catcher in the majors is physically demanding. A backup catcher is important in that they can step in when the starter goes down, or give the starter an off day now and then.
For two seasons now, Bryan Holaday has been a very solid backup to Alfaro and J.T. Realmuto before him. Holaday was weak at the plate in 2018, with a .205/.261/.258 slashline, but more than made up for it by leading the National League with a 45 percent kill-rate on runners trying to steal.