Four-seam fastball
The four-seam fastball is a backspin pitch where the seams appear four times per revolution.
It is the fastest pitch type and reaches the catcher's mitt with minimal movement.
In Japan, it is often called a “straight” because of its relatively linear path.
Fastballs are generally distinguished between the four-seamer—which has a clean spin axis and trajectory—and variations like the two-seam or one-seam fastball, which have unbalanced spin axes and therefore exhibit more movement.
In Major League Baseball (MLB), the four-seam fastball is categorized as one type of fastball.
However, in Japan, pitches are generally divided into “straight” (fastballs) and breaking balls.
In MLB, many pitchers rarely throw a traditional four-seamer, instead relying more on two-seam fastballs, sinkers, or cut fastballs.
In contrast, in Japan, virtually every pitcher uses a straight (four-seam) fastball as a fundamental pitch.
Grip and Release
Place your index finger, middle finger, thumb, and ring finger on the ball, with the index and middle fingers positioned across the seams.
Narrowing the gap between the index and middle fingers allows more force to be transferred to the ball, resulting in higher velocity and stronger spin.
However, this can sometimes make control less stable.
The arm should be swung through naturally without twisting.
Avoid excessive tension, and instead use centrifugal force to efficiently transfer energy from the shoulder, elbow, wrist, and fingertips into the ball.
At release, the ball should be pushed forward primarily by the index and middle fingers.
By firmly applying your fingers to the seams, you can maximize energy transfer and generate strong backspin, resulting in a “rising” fastball effect with excellent carry that pops the catcher's mitt.
Start by focusing on throwing the ball with good velocity and strength.
Once you can consistently transfer energy into the ball, work on refining your release point and improving control.