Slider
The slider is a breaking pitch that moves laterally, “sliding” away from the pitcher’s throwing hand.
For a right-handed pitcher, it breaks toward the left-handed batter’s side.
For a left-handed pitcher, it breaks toward the right-handed batter’s side.
While its direction of movement is similar to a curveball, the slider is thrown with higher velocity.
Instead of a smooth, arcing trajectory like a curveball, it travels on a path closer to a fastball before making a sharp, late break just in front of the batter.
Against same-handed hitters (right vs. right or left vs. left), the slider breaks away from the bat, making it highly effective for generating swings and misses.
Today, the slider is one of the most commonly used breaking pitches.
It can be used both as a strike-throwing pitch early in the count and as a put-away pitch to finish hitters.
Grip and Release
The slider can have different types of movement depending on the release and spin:
A more horizontal, sweeping break
A diagonal, downward break
A sharper, more vertical drop
Because it is such a widely used pitch, it has been extensively studied and developed, resulting in many variations and different names.
In Major League Baseball, sliders with more vertical break have become more common, while those with strong horizontal movement are often categorized separately as “sweepers.”
The cut fastball (cutter) can also be considered a variation of the slider that prioritizes velocity over movement.