This article is about the baseball pitch. For the 2012 documentary film, see Knuckleball!
Hall of Fame knuckleballer Hoyt Wilhelm shows how he placed his fingers before a pitch.
A knuckleball or knuckler is a baseballpitch thrown to minimize the spin of the ball in flight, causing an erratic, unpredictable motion. The air flow over a seam of the ball causes the ball to transition from laminar to turbulent flow. This transition adds a deflecting force on the side of the baseball. This makes the pitch difficult for batters to hit, but also difficult for pitchers to control and catchers to catch; umpires are challenged as well, as the ball's irregular motion through the air makes it harder to call balls and strikes. A pitcher who throws knuckleballs is known as a knuckleballer.