STATE COLLEGE, Pa. -- Mitch Keller, the top prospect in the Pirates' system, has debuted this year — much earlier than expected. The 23-year-old has just 21 AAA starts over two seasons, so with such a rushed timetable, how are we to properly judge our first look at a hurler who, at the very least, is projected to slide in as a rotation anchor?
Keller has had a rocky go of things over his first three starts. Incremental improvement has been seen, to be sure.