The last part of this prospect series is arguably the most difficult: saves. Very rarely does a prospect move through a system as a true reliever. After all, even the greatest closer of all-time, Mariano Rivera, worked as a starter for most of his minor league career.
As regular readers know, I always believe a starter is a starter until he proves at the highest level that he is not one. None of the names below are close to that yet. However, they have some red flags that, for various reasons, cause some concern about their ability to start long-term.
With that in mind, here are some very good starting pitching prospects who could someday become even better late-inning relievers.