One of baseball’s oldest catchphrases is “spin to win.” For most of the game’s history, it referred to the success a pitcher could have with a particularly nasty curveball. Now, as analytics and ...

Baseball has evolved into a game of velocity and spin rate, with pitchers and hitters alike striving for maximum performance. However, as velocity and spin rates increase, so does the risk of injury.

The concept of “spin efficiency” was first introduced in an article entitled “All Spin Is Not Alike” written by one of us several years ago, although those words were not actually used. The essential ...