ESPN.com has a fantastic article on the best pitching coach of all time, Leo Mazzone

There are those who suggest Mazzone’s success is based more on good fortune than anything else. Who wouldn’t look good coaching Maddux, Smoltz, Glavine, Steve Avery, Neagle, Mark Wohlers and the other great pitchers acquired by general manager John Schuerholz or developed in the Braves’ farm system? But the fact is this: Most pitchers get better when they join the Braves, and many get worse after they depart.

There is clear evidence. Economist J.C. Bradbury’s concludes from his extensive statistical analysis at the Sabernomics Blog, that “working with Leo shaves off between .55 and .85 points of a pitcher’s ERA.”

I think Jorge Sosa would be the latest success story of the Mazzone model.

UPDATE And don’t forget Bobby Cox.

FURTHER UPDATE The QandO Blog (usually centered around free trade and markets) is going to enjoy the chop well into October as well.