How to throw different junk ball pitches.
Pitchers can utilize a variety of different grips in order to throw off a batter's timing in throwing junk balls. For instance, when throwing a curve ball, pitchers can keep their pointer and middle finger together on the ball to create a 12 to 6 trajectory on the ball.
Likewise, when throwing a slider, pitchers are going to keep their fingers together on the ball to create a more horizontal movement on the ball, as the ball breaks away from a right-handed batter as released from a right-handed pitcher.
When throwing a gyro ball, pitchers are attempting to put a football spiral spin on the ball in order to deceive the batter. When throwing a palm ball, pitchers are going to use a four finger grip in order to have the ball drop below the batter's eye level.
When throwing a split-finger fastball, pitchers are going to throw a fastball type pitch that drops and darts quickly downward. When throwing a forkball, pitchers are going to use a variety of the split-finger fastball deeper in the grip so as to create a tumbling action with the ball.
Lastly, the shuto pitch, as thrown in Japan, requires pitchers to throw a ball that has side spin on it, to dive into a batter's hands, much like a screwball or a two-seam fastball.
These area a variety of different junk ball pitches that pitchers can utilize to be an effective junk ball pitcher.