Predicting surprise: Young players who could shine for Nationals, Astros in 2018

The Nationals and Astros both made the postseason in 2017, but they finished in very different ways. These two teams already have the core roster elements necessary to make return trips, but they will also have to ride the success of the likes of Wilmer Difo and Chris Devenski, who both stepped into larger roles in 2017 and hope to keep those this year.