Sinker (pitch)

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In baseball, a sinker or sinking fastball is a type of fastball which has significant downward and horizontal movement and is known for inducing ground balls.^[1] Pitchers capable of utilizing the sinker are able to throw the pitch almost exclusively, as it forces weak contact and ground balls, allowing them to rely less on secondary pitches in order to change speeds.^[2] While coaches agree that this pitch is very similar to the two-seam fastball, a two-seamer tends to have more lateral movement than a sinker.^[3] In either case, the pitch is thrown in a two-seam orientation and has a gyro angle far from 0 degrees, leading to seam-shifted wake effects that cause downward and lateral movement compared to a four-seam fastball.