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Reply to "Pitching anomaly"

Four-seam fastballs have four seams spinning counter clockwise with horizontal axes. The bottom seams rotate forward to collide with air molecules and create increased pressure. The top seams rotate away from the air molecules and create decreased pressure. As a result, four seam fastballs have increased pressure below the baseball and decreased pressure on top of the baseball. These pressures cause four seam fastballs to move upwardly, giving it the natural rise. The four-seam fastball also generates more velocity because you are able to impart greater spin on it with the additional top seam you grip. The extra seam allows you to have better grip, and naturally allows you to create more spin by creating downward pressure against the seam. I think two-seamers have naturally sinking motion because of the natural motion of your arm when you throw a ball. The pronation of your arm when you pitch tilts the seams to a degree when the same process that happens to a four-seamer, happens to a two-seamer, but in a different direction because the seams are aligned differently when you release them.
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