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How to throw a slider
Place your index and middle fingers.
Grip the baseball with your index and middle fingers placed tightly together across an outer seam of the ball located at the horseshoe or u-shape seam. For right-handers, place your middle finger across the right half of the seam.
Left-handers should do the opposite: place your middle finger across the left half of the seam. This should position your fingers towards the outside of the ball (off-center).