Most impressive to me is Duffey's maturity as a pitcher. He arrived with a fully functional repertoire of pitches, not trying to add mph to his fastball or learning to control his curve. He pitches within himself, commanding the zone with good mechanics. You can see that his catchers love the guy, their delight apparent even as they dig a strikeout curve ball out of the dirt. Improving Duffey's stuff will be a matter of tweaking his change-up and learning not to yank his fastball quite so often. If Duffey threw his change on the same flight path as his dirt ball curve, that could cause nightmares for hitters. How would you like to swing half a foot over the curve, then try to get down for the curve, only to swing half a foot under a change-up? Then you think you've got that figured out, he throws a two-seamer on the corner, and his 91mph heater looks like it's going 96. Literally there's nothing a hitter can anticipate with Duffey. He'll throw the curve on any count, and he's not going to walk you. And he won't just throw the curve for a strike; it's going to be a strike low on a corner. And even his high curve has that crazy bend... Yikes.