Exhibition Team logoLos Angeles Angels of Anaheim hat dark logoArizona Diamondbacks hat dark logoBaltimore Orioles hat dark logoBoston Red Sox hat dark logoChicago Cubs hat dark logoCincinnati Reds dark logoCleveland Indians hat dark logoColorado Rockies hat dark logoDetroit Tigers dark logoHouston Astros hat dark logoKansas City Royals hat dark logoLos Angeles Dodgers hat dark logoWashington Nationals dark logoNew York Mets hat dark logoOakland Athletics cap logoPittsburgh Pirates hat dark logoSan Diego Padres cap logo on lightSeattle Mariners hat dark logoSan Francisco Giants hat dark logoSt. Louis Cardinals dark logoTampa Bay Rays hat dark logoTexas Rangers cap logoToronto Blue Jays hat dark logoMinnesota Twins hat dark logoPhiladelphia Phillies hat dark logoAtlanta Braves hat dark logoChicago White Sox hat dark logoMiami Marlins cap logoNew York Yankees hat dark logoMilwaukee Brewers cap logo

What is Direction of Movement Due to Spin?

Every pitched baseball spins in a certain direction. The direction of the spin around an axis, along with the spin rate, helps inform the movement of the ball.

In the rows below, you may find each pitcher's spin direction per pitch type, from the hitter's perspective. The length of each bar is proportionate to how often the pitch spins in that direction. Each pitcher has two charts. On the right: Observed movement is shown based on plate location and initial velocity vector. On the left: Spin-based movement is shown over the initial part of the flight towards home. (To view individual pitches, click here.)

Gap: Difference between the Spin-Based Movement values of the two pitches. "The gap between his 4-seamer and sinker..."

While the two charts will generally agree, slight differences between the movement of spin at pitch release and upon reaching home implies additional aerodynamic forces at work. (Read more about this here.)

Click on any player line to see an enlargement of the thumbnail.