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End threads, that is.
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James and Neyer summarized their book on pitchers by saying that even starters could get by on ONE great pitch, along with some show-me pitches, I guess.
Aaron Sele's curve ball, Schilling's and Colon's heaters. There have been groundball pitchers who came with the fastball just about every pitch.
But yeah. You want to see two knockdown K pitches if you're going to go with two.
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What I can't get, is how a guy like Carl Willis has not noticed the existences of the Clayton Kershaws and Erik Bedards of the world. Two-pitch lefties aren't even uncommon.