Generally the four-seam fastball is a straighter pitch with a 1-2 mph increase in velocity over the two-seam. When throwing opposite arm-side, righty away from righty or lefty away from lefty, you have the option to throw the four-seam straight fastball to...
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2 Seam Fastball
The grip on the seams of the baseball will determine the airflow around the ball while it is in flight. This will effect the movement of the ball on the way to the plate. The two-seam fastball will have more...