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Like it or not, the Cardinals will have plenty of rookies on the roster for the postseason. The Cardinals played 20 rookies in the 2013 season.
The vast majority of the rookies were pitchers, and most had a very positive impact. For the Cardinals to have success in the playoffs, they will need continued excellence from the likes of Shelby Miller, Kevin Siegrist, Seth Maness and Michael Wacha.
Trevor Rosenthal technically counts as a rookie, but he does have some postseason experience from last season, which will come in handy as the Cardinals make their playoff run.
Shelby Miller pitched very well down the stretch, posting a 3-0 record with a 2.76 ERA in September. He will need to keep up that type of pitching for the Cardinals to have an extended run in October. As a bonus, Miller also has some postseason experience, pitching in the NLCS for the Cardinals last season.
It'll be interesting to see where Wacha ends up on the roster, but after his near no-hitter to end his 2013 season, surely he'll find a spot on the 25-man playoff roster.
With all these rookies and their live arms, the Cardinals should be well stocked for the postseason run.