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The knuckleball is a slow baseball pitch thrown with minimal spin. Pitchers grip the ball with their knuckles or fingertips pressed against the top, causing it to move erratically and unpredictably due to air currents. This makes it difficult for batters to hit solidly and for catchers to handle. Few pitchers specialize in the knuckleball, but those who do, known as knuckleballers, can have long careers due to the minimal strain on their arms. Phil Niekro is considered one of the greatest knuckleball pitchers in Major League Baseball history.1234

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