You see it happen often - to both pitchers and hitters.
Kid plays at a great baseball program at a P5. And, he dominates for 3 straight years and gets drafted in the 1st round of the MLB draft.
But, once he goes pro, his progress stalls. Sometimes they never succeed in the minors at all. Or, maybe the just get a cup of coffee at best in the majors and never really make it at the MLB level.
Why and how does this happen so often?