Curveball
A curveball follows an arched trajectory, decelerating sharply before reaching the batter and breaking away from the pitcher's throwing arm.
It is the quintessential breaking ball, known for having the most movement of any pitch type.
Almost every pitcher has experimented with it at least once.
Because it is slower than a fastball, it is frequently used to disrupt a hitter’s timing.
When it features a large vertical drop, it can also be a devastating weapon to generate swings and misses.
Simply making the ball curve is easy; most people can do it by twisting their wrist or arm.
However, throwing a curveball that is effective in a game—while also avoiding excessive strain on the elbow—is significantly more difficult.
There are countless variations in grips and movement, making the curveball both a fundamental and profoundly deep pitch.
Grip and Release
The standard grip involves placing the middle finger along the seam, with the thumb supporting the ball between the opposite seam and the bottom of the ball.
The index finger is typically not used for pressure; it may rest lightly against the middle finger, be lifted off the ball, or tucked away (as seen in a knuckle-curve grip).
Avoid gripping the ball too deeply, as this makes it harder to generate spin.
Instead, maintain a gap between the ball and the space between your thumb and index finger.
While it’s common to think a curveball is thrown by twisting the wrist or elbow, this is not actually how spin is generated.
Instead, the pitch relies on the overall whip-like motion of the arm, the angle of the wrist at release, and a vertical wrist action.
As you deliver the pitch, imagine your arm motion “coming over the top” of the ball along its intended trajectory.
At release, your wrist should naturally rotate so that the back of your hand faces outward.
At the moment of release, use your middle finger (which is in contact with the seam) to “brush” over the top of the ball. This creates a rolling motion, with the ball spinning off the middle finger as its pivot point.
This sensation is often described as “taking something off” or “letting the ball slip out.”
Unlike a fastball—where the ball is firmly pushed with the index and middle fingers—the curveball does not rely on forceful finger pressure to create spin.
Instead, the middle finger acts as a pivot point.
Be careful not to grip too tightly with your thumb at release.
If you do, the ball will not roll properly off the fingers, resulting in a pitch with poor spin and reduced break.
Also note: while the back of the hand faces outward at release, you should not forcibly twist it into that position.
Allow it to rotate naturally as your arm comes through the throwing motion.
There are many variations of curveballs in terms of grip, release, and movement.
Experiment with different techniques to find the curveball that works best for you.