Dunning allowed two runs on five hits and two walks while striking out two over three relief innings in Saturday's 7-3 loss to Toronto.
Dunning made his first appearance after being activated off the 15-day injured list Thursday. The right-hander opened the season as part of the Rangers' rotation but has since been moved to the bullpen. His length as a starter likely means he'll be used as a multi-inning reliever, which will come in handy when a starter doesn't get deep. That was the case Saturday when Michael Lorenzen couldn't get out of the first inning.