Having struggled with walks, command, and mechanical inconsistencies the first two months of the 2014 season, Miller added a sinker to his repertoire with the help of Justin Masterson and defeated the Toronto Blue Jays 5–0 in a complete-game shutout, his first of the season and second of his career. He took a no-hitter into the sixth inning, faced 30 total batters while striking out five and enjoyed much more consistent command. He finished the season with a 3.74 ERA in 31 games started. Miller pitched Game 4 of the 2014 NLDS, which the Cardinals won, and Game 4 of the 2014 NLCS, where he struggled, failing to complete the fourth inning.