Yoshida was fourteen-years-old when she taught herself how to throw the knuckleball after watching Major League Baseball pitcher Tim Wakefield on television.
While playing for Cleveland, Porter had the task of catching for knuckleballer Hoyt Wilhelm.
The Niekro brothers, Phil Niekro and Joe Niekro, were Major League knuckleball pitchers.
Niekro tutored his nephew, Lance Niekro, to throw a knuckleball after Lance's unsuccessful stints as a power-hitting first base prospect with the San Francisco Giants.
However, spherical bullets do tend to rotate randomly during flight, and the Magnus effect means that even a relatively smooth sphere will curve when rotating on any axis not parallel to the direction of travel (see knuckleball for an example of intentional random tumbling.)