To expand on Nicolino:
Check out how polished those mechanics are and how well he commands that fastball...There might be one offspeed, maybe two offspeeds in that video (both changeups, one on the very first pitch) as he efficiently gets himself two outs. It's a hell of a package for any pitching prospect, but throw in big and left handed? Yes please. He hits his spot almost every time there, and when he misses it's not a very hittable miss.
OTOH, he is not a teenager. He's 20.