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I wonder about this too.
It's one thing to "hang" a curve, to throw it high without enough spin so that it floats. But if the curve is tight-spin, does it matter where in the strike zone it is?
Randy Johnson threw 9,000 sliders right down the heart of the plate. Erik Bedard throws that yakker simply for a called strike. Did the rookie Clayton Kershaw throw his curve to both sides of the plate?
If the lefty's fastball is scary and the yakker breaks hard, is the location of the curve important? The MLB hitter is always defending fastball anyway.