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Sort fangraphs > leaders > plate discipline by Z-swing % -- how often a hitter swings at a ball in the strike zone --
and Fister is HILARIOUSLY better than EVERYBODY IN THE MAJOR LEAGUES. He's at 55% and best in the majors right now is Gallardo at 59.9%.
I think that if you examine the Fangraphs table on Z-swing %, and consider Fister's 55.4% rate, that gives you the idea on this kid. No wonder S% was giving people the wrong idea on him.