Barnes will catch and bat eighth against the Padres on Tuesday.
After sitting in favor of A.J. Ellis on Opening Day, Barnes will slot into the lineup Tuesday for his ninth start at the major league level. With Yasmani Grandal (forearm) on the DL, the door is open for Barnes to split time behind the plate in the short term, and manager Dave Roberts suggested the team could keep three catchers after Grandal's return.