Reds skipper Dusty Baker decided to start Heisey in Tuesday night's contest.
"He was just getting his stroke down in Triple-A," Baker said. "He was really here out of necessity as much as anything, and I don't think it's a matter of comfort. I think it's helped him to sit here and learn and listen and see what it's all about. I don't think he's overwhelmed. I think he's going to contribute at some point in time. He's a tough kid and he's not intimidated by anything, and he's had to fight his way to get to where he is."