Dunning will start Tuesday against the Cardinals.
Dunning, who opened the season as a long reliever, continues to fill in for the injured Jacob deGrom (elbow), who was transferred to the 60-day injured list Monday. Tuesday will be Dunning's sixth turn through the rotation, and he should get at least another four before deGrom's earliest return date, June 28. Dunning has a 2.28 ERA with 21 strikeouts and six walks over 27.2 innings as a starter.