The concept of spin rate isn’t worth much without understanding spin axis and maximizing spin efficiency
At the end of last month, FanGraphs rolled out a new pitcher valuation metric: Fielding Dependent Pitching (or FDP). This week, at Beyond the Boxscore, we describe it to our readers, as well as provide FDP looks at great Braves starters.
Bill Petti (now with Fangraphs and with roots at Beyond the Box Score) appeared on the MLB Network's Clubhouse Confidential to discuss park factors.
Some pitching metrics are more descriptive than predictive. Here's a quick reference for which metrics correlate year-to-year for starting pitchers.