Burnett is coming back after sustaining a broken right orbital bone in Spring Training.
"We were hoping on Opening Day that he would be out there," Pirates catcher Rod Barajas said. "We had to wait a little bit longer, and we're all excited. We are excited for A.J.
"I know what he's capable of and I had an opportunity to catch him when he was doing pretty well, so we have the same expectations. We've all been waiting for this and we're real excited for him and for the team, because I think he's going to be a big part of this season and I think he's going to go out there and give us a chance to win."