BA Scouting report:
"Erwin is the top pitching prospect on a talented Clemson squad that includes pro prospects all over the diamond. At his best, Erwin will show the potential for three above-average pitches. His fastball can bump 92 mph, but operates mostly at 88-90. Erwin commands his fastball well to his arm side, with the ability to go up and down the zone, and he can also hit the zone down and to his glove side. His best secondary pitch is his curveball, which projects as an above-average pitch. When Erwin is on top of it, the offering shows 1-to-7 break and consistently tight spin. His third pitch is a split-finger changeup, which he can pound down and to both sides of the plate. The change shows late fade and tumble, and is a swing-and-miss pitch when Erwin buries it at the knees, though he can hang it at times. Erwin is an outstanding athlete, with a well-coordinated stride and excellent balance. He uses his torso well, and gets outstanding extension towards the plate, allowing his stuff to jump on hitters."