What Pitches are Illegal in Baseball?

Baseball has been around for a long time and is one of the most popular sports in the United States and around the world. A big part of the game is the pitcher throwing a variety of pitches to the batter. Baseball pitches are an important part of the game and can be used to great effect. However, there are some pitches that are illegal in baseball, and a pitcher must be aware of them.

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Definition of an Illegal Pitch

The definition of an illegal pitch in baseball is one that does not conform to the rules of the game. Pitches can be illegal for a variety of reasons, such as a pitcher throwing the ball in an illegal manner or throwing a pitch that is outside the strike zone. Illegal pitches can also include pitches that are thrown with an illegal grip or that break the rules for pitch speed or spin.

Common Illegal Pitches

There are several types of illegal pitches that are commonly seen in baseball. One of the most common is the spitball, which is a pitch that is thrown with an illegal grip and can cause the ball to move unpredictably. Another common illegal pitch is the scuffball, which is a pitch that is thrown with a scuffed up ball or an illegal substance on it. This type of pitch is designed to give the ball an unpredictable movement.

Illegal Pitches and Penalties

When an illegal pitch is thrown, the umpire has the power to call a “ball” or a “strike” depending on the situation. If the pitch is determined to be illegal, the umpire can call a “dead ball” and award a ball to the batter. Depending on the severity of the illegal pitch, the umpire may also choose to eject the pitcher from the game and impose a fine or suspension.

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Preventing Illegal Pitches

Pitchers can take steps to prevent themselves from throwing illegal pitches. The most important thing is for the pitcher to familiarize themselves with the rules of the game and be aware of what pitches are legal and what pitches are illegal. It is also important for pitchers to pay attention to their grip and make sure they are not throwing with an illegal grip. Finally, it is important for pitchers to be aware of the speed and spin of their pitches and make sure they are not breaking the rules in those areas.


Illegal pitches are an important part of baseball and can have a big impact on the outcome of a game. It is important for pitchers to be aware of what pitches are illegal and to follow the rules of the game. By learning the rules and being aware of their grip, speed, and spin, pitchers can ensure they are not throwing illegal pitches.