When thrown, try to manipulate the pitch to come off of the thumb-side of your index finger – NOT your index- and middle-fingers, as with a two-seam fastball – because a two-finger release will cause the pitch to balance out, which reduces the spin that you are looking for. Most good slider pitchers grip the outer-third of the baseball and cock their wrist slightly, but not stiffly, to their throwing hand's thumb-side upon release of the pitch. This enables a pitcher to apply pressure to the outer-half of the ball with the index finger. Avoid any twisting of the wrist upon release.
In 2004 we developed the first evidence-based pitching program based on sports science research, instead of common coaching beliefs. Through this research we've also learned video analysis is still the best and most accurate way to assess pitching mechanics. We not only show pitchers at all levels their faults and the adjustments, but work with there style in order to improve their velocity and control, all while reducing their risk of arm injuries. The true difference about our coaching methods are simple, our clients will truly feel the difference and that's the only true way towards improvement and development.

Any baseball pitch begins with how the pitcher grips the ball. To throw a curveball, a pitcher must hold the baseball between his thumb and his index and middle fingers, with the middle finger resting on the baseball seam. When the pitcher comes through his motion to throw the ball, he snaps his wrist downward as he releases the ball, which gives the ball topspin. If the pitcher throws properly, the back of the his hand will be facing the batter at the end of the motion. The ball will break down and away from a right-handed batter if thrown by a right-handed pitcher.
Certain relief pitchers specialize in this type of slider. Known as “Lefty One Out GuYs” (LOOGYs) or “Righty One Out GuYs” (ROOGYs), they are brought into a game to face a dangerous same-handed batter. They usually feed the opponent a steady diet of these “runaway” sliders, tempting the batter to swing at a ball that looks like a strike – but isn’t.
In the stride phase of the pitching motion, a pitcher should be able to draw an imaginary line from the heel of his back foot, through the ball of his stride foot, and onward to the target. Keeping the lower body aligned in a straight line closes a pitcher's hips, directs the shoulders, and allows the throwing arm to reach the "high cock phase" of its arm path in the back of the pitcher's body. Additionally, if a pitcher lands too far to the glove-side of his body, he will open the shoulder too soon. This causes the pitch to be low and outside while creating stress on the arm and reducing velocity. If a pitcher lands too far to the throwing-side, he will inevitably have to throw across his body making the outside part of the strike zone difficult to hit. Plus, if a pitcher throws across his body, he creates an increased amount of stress on the arm.
One thing I did with this pitch in college and in professional baseball was to always throw my two-seam fastball to the throwing-hand side of the plate and my four seam fastball to the glove-hand side of the plate. In other words, because I'm a righty, I'd throw two-seamers inside to right-handed batters and four-seamers away. I always liked how the feel of the grip of the two-seamer in my glove (when I was in my pre-pitch stance) let me know on a sub-conscious level that I was going inside on guy.
One thing I did with this pitch in college and in professional baseball was to always throw my two-seam fastball to the throwing-hand side of the plate and my four seam fastball to the glove-hand side of the plate. In other words, because I'm a righty, I'd throw two-seamers inside to right-handed batters and four-seamers away. I always liked how the feel of the grip of the two-seamer in my glove (when I was in my pre-pitch stance) let me know on a sub-conscious level that I was going inside on guy.
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