2017 was the last full season with Mike Matheny as the manager of the St. Louis Cardinals and the Cards finished with a cumulative 24 Defensive Runs Saved which was joint 10th in the majors. Matheny was then replaced by Mike Shildt midway through 2018 and in this season the Cards dropped off slightly. Having just 22 DRS which was only 9th best in just the National League, nevermind all of MLB.
Mike Shildt’s first full season in charge of the Cards was 2019, and in this season Shildt lead the franchise to their highest DRS on record (Fielding Bible data going back to 2003) with a giant 91 Defensive Runs Saved.