Forkball
The forkball travels on a trajectory similar to a fastball before rapidly decelerating and dropping as it approaches the plate.
In Japan, it is a quintessential swing-and-miss pitch.
By splitting the ball between the fingers, spin is reduced at release, which increases air resistance and causes the ball to decelerate and drop.
Essentially: less spin leads to more air resistance, which means more time under the influence of gravity, resulting in a greater vertical drop.
This shows that air resistance is a crucial factor for the forkball.
The higher the velocity, the greater the air resistance and the sharper the break.
Since it often results in pitches that bounce in the dirt, the catcher’s receiving and blocking ability becomes vital.
Because the ball is gripped by splitting it between the fingers, both finger length and grip strength are necessary.
While finger length is largely determined by genetics, grip strength can be developed through training.
The forkball is more unstable than other pitches; without sufficient grip strength, the ball may slip out earlier than intended when thrown with full arm speed, leading to poor control.
Endurance is also important.
Without it, the number of effective forkballs you can throw decreases, and fatigue in grip strength may negatively affect other pitches as well.
Since the ball is held firmly until the moment of release, pitchers tend to tense up their arm during the throw.
This stiffness increases stress on the elbow, making the forkball a pitch with a relatively high risk of injury.
Grip and Release
Grip the ball by splitting it between the index and middle fingers without placing them directly on the seams.
The wider you spread your fingers, the harder it becomes to generate spin, resulting in a sharper drop.
As an alternative grip, some pitchers—especially those with shorter fingers—may use a variation where the ball is split between the thumb and index finger.
Do not rely on the fingertips.
Instead, release the ball by letting it slip out from between the index and middle fingers.
Because the ball is not gripped along the seams, slight differences in finger length can naturally create some arm-side spin.
Additionally, variations in seam orientation and grip can affect both spin and air resistance, resulting in different types of drop and movement.
The forkball is most effective when thrown with fastball arm speed while minimizing spin.
Experiment with grip width, seam orientation, and release to develop a forkball that suits your hand size and pitching style.