Instead of using it to grip the ball, you'll be using it to point at where you want the ball to go. [substeps] Hold the baseball such that the curves of the seams are close to your palm, with one on top and one on the bottom of your palm.
[header] How to throw a curveball [title] Grip the ball between your thumb and middle finger. [step] Place your middle finger along the bottom seam of the baseball and your thumb along the back seam. Leave your index finger off the ball.