Found January 18, 2013 on Baseball Professor:
I spend a lot of time looking at pitchers’ repertoires on PitchFX. Part of that is the Moneyball effect, that looking at stats and numbers independent of names and scouting reports gives you valuable objectivity. The other part of that is there’s only so many hours in the day and I fill most of them with work, family, and other responsibilities. As much as I’d love to sit down and spend hours evaluating Wily Peralta, I have other things to do. And that’s why I love PitchFX. You lose a lot of the mental side of pitching — approaching batters, holding runners on, pitching with a lead, etc. — but you still get a very good feel for how a pitcher actually pitches and how good his stuff is. In my years of explaining why some pitchers succeed and why some do not, I’ve come across one fairly universal rule: The separation in velocity between a pitcher’s fastball and their change-up is extremely important. Francisco Liriano and Javier Vazquez have had some famously erratic seasons, and much ...
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