Knuckle curve

In Major League history, the term knuckle curve or knuckle curveball has been used to describe three entirely different pitches.

The first, more common pitch called the knuckle curve is really a standard curveball, thrown with one or more of the index or mean fingers bent. According to practitioners, this gives them a better grip on the ball and allows for tighter spin and greater movement. In all other respects, this knuckle curve is identical to the standard curveball. This version of the knuckle curve is currently used by Major League pitchers Dan Haren, J. P. Howell, Phil Hughes, and Brad Peacock. Mike Mussina was well known for his incorporation of the pitch into his repertoire. Justin Verlander formerly threw a knuckle curve but was forced to abandon the pitch due to problems with blisters. This knuckle curve is usually called the spike curve by MLB players and coaches because the pitch is nothing like a knuckleball.