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 Cliff Lee, J. P. Howell, Phil Hughes, A.J. Burnett and Gil Meche. Mike Mussina was well known for his incorporation of the pitch into his repertoire
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