"To begin, I used The Lahman Baseball Archive to identify all pitchers who pitched at least one full season for Leo Mazzone over their careers... The verdict: having Leo Mazzone as a pitching coach lowered a pitcher's ERA by a little more than half a run." - discu.eu

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"To begin, I used The Lahman Baseball Archive to identify all pitchers who pitched at least one full season for Leo Mazzone over their careers... The verdict: having Leo Mazzone as a pitching coach lowered a pitcher's ERA by a little more than half a run." http://baseballanalysts.com/archives/2005/03/the_mazzone_eff_1.php 6 comments 2/7/2011 baseball

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