Wainwright was scratched from Sunday's Grapefruit League start against the Nationals, Ben Federickson of the St. Louis Post-Dispatch reports.
The details as to why Wainwright will not be making his final tuneup start this spring haven't been revealed, so it's difficult to say if this is injury-related or not. Manager Mike Matheny is scheduled to address reporters Sunday afternoon, so an update should be provided at that time. Jordan Hicks will take the mound in Wainwright's place.