Vertical slider
Unlike a standard slider, the vertical slider moves almost entirely in a downward direction.
Its movement is similar to a forkball, making it an excellent put-away pitch for generating swings and misses, but it does not have the same rapid deceleration as a forkball.
From a hitter’s perspective, while a forkball slows down as it drops, the vertical slider feels as though it is "carrying" through the zone despite its downward break.
Because it has minimal horizontal movement, it is less affected by the batter’s handedness, making it a highly versatile weapon.
Due to its effectiveness, the vertical slider has become increasingly popular in recent years, making the pure horizontal slider somewhat less common in some contexts.
However, in Major League Baseball, the rise of uppercut swings associated with the “fly ball revolution” has led to increased interest in horizontal sliders (often called sweepers), which better exploit the width of the strike zone.
In Japan, the vertical slider is often associated with what is commonly referred to as a “gyroball,” due to its spin characteristics.
Grip and Release
Start with a standard slider grip, then rotate the ball slightly so that it is oriented more from top to bottom.
This adjustment shifts the seam position under the thumb by about one seam.
The wrist action is similar to a slider: slightly turned outward and released with a chopping motion.
The key difference lies in the direction of the cut.
While a standard slider is released with a forward, lateral cutting action, the vertical slider is released with a more downward, “pulling” or “scratching” motion.
Rather than relying on finger action alone, think of generating spin by driving your entire arm downward through the pitch.
Delaying your release point and bringing it further out in front of your body can help create a more natural downward motion.
If your pitching motion releases the ball too early, it may be difficult to generate a clean, sharp vertical break.
The vertical slider is most effective when thrown with proper timing and a consistent release point.
Focus on combining arm speed with a downward motion to maximize both deception and break.