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Steve Carlton had less-than-radioactive velocity, yet with the high K rate based on the crackling slider.
Sandy Koufax, Randy Johnson, Lefty Grove built their games around challenge 97 mph fastballs out and over the plate... as y'know Koufax' and Johnson's breaking pitches were wipeout too, but sheer velo was the bread and butter ...
Gio has pretty good giddyup for his template though...