Leahy will open the season in the Cardinals' rotation, Daniel Guerrero of the St. Louis Post-Dispatch reports.
Leahy's regular-season debut will occur March 30 with a start at home against the Mets. The right-hander has not been used as a starting pitcher regularly since 2022, but he often worked multiple innings out of the Cardinals' bullpen last season and was stretched out as a starter this spring, finishing with a 4.58 ERA and 20:5 K:BB over 17.2 frames. Leahy has not reached 90 innings in any of the last three seasons while being used in the bullpen, so he's sure to face some form of workload restrictions in 2026.