The baseball statistic that’s changing MLB — for better or worse

Major League Baseball recently released a report on pitcher injuries, based on interviews with 200 experts, highlighting the use of “stuff” metrics like Stuff+ to evaluate pitch quality and pitcher health. These metrics, which analyze velocity, spin, and movement, have revolutionized player development and scouting, becoming essential tools for coaches, analysts, and players alike. Pioneered by analysts like Jeremy Greenhouse and Harry Pavlidis, Stuff+ is now widely used in baseball, emphasizing the importance of velocity and movement in generating swings and misses.

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