Curveball Meaning in Baseball

Definition: A curveball is a type of “breaking pitch” that is thrown with a specific grip and wrist motion to make the ball dive downward or sideways as it approaches the hitter. While a fastball travels in a relatively straight line, a curveball is designed to deceive the batter by appearing to be at one height before “dropping off a table” at the last second. This change in direction is caused by topspin, which creates air pressure that forces the ball to curve toward the ground.

The secret to throwing a curveball lies in the grip and the release. The pitcher usually places their middle finger along the seam of the baseball and, as they release the ball, they “snap” their wrist downward, almost like they are pulling down a window shade. This motion creates a heavy amount of spin. To a hitter, a curveball can be terrifying because it often looks like it is going to hit them in the head or chest before it suddenly breaks into the strike zone. If the batter misjudges the break, they will often swing over the top of the ball or “buckle” their knees and freeze as the ball crosses the plate for a strike.

Strategically, the curveball is used to keep hitters from getting comfortable with high-speed pitches. It is significantly slower than a fastball, which ruins the hitter’s timing. However, throwing a curveball is risky for a pitcher. If they don’t “snap” their wrist correctly, the ball might not curve at all—this is called a “hanging curveball.” A hanging curveball stays high and slow in the middle of the plate, making it very easy for a professional hitter to smash it for a home run. Because of the intense stress the snapping motion puts on the arm, young players are often discouraged from throwing curveballs until their muscles are fully developed.

Example: The pitcher fooled the batter with a sharp curveball that started high but dropped into the catcher’s glove for a called third strike.