Of the 131 pitchers in our data set — pitchers who had thrown at least 150 fastballs since June 15 — fastball spin rates fell for all but 29 of them. And a handful of pitchers’ spin rates changed drastically, including nine whose fastballs lost 200 revolutions per minute or more. Pitchers with biggest decreasesThese are the pitchers whose spin rates on fastballs fell the most. (Some of these pitchers have openly discussed the effect of sticky substances, but several things — like injuries, changing pitching strategies or simply random poor performance — can account for changes in spin rates for individual pitchers.) Or use the tool below to see how spin rates changed for any pitcher in our analysis.

Source: New York Times July 19, 2021 09:02 UTC