quote:Originally posted by J.Weaver #5:
Many left-handers have natural tail, not cut. The ball goes back arm-side, not to glove-side.
I'm a lefty and my 2-seam has always had a natural cut, i.e. in on right-handers. I don't believe it has to do with supination/pronation as I release it the same as my 4-seam. I assume is has something to do with the effects of the air on the seams during flight. I don't throw hard anymore, never did actually, but the ball still cuts at BP speed.
My experience coaching young players is that many naturally supinate and need to be taught to keep their wrist behind the ball, i.e. no supination. I don't think this has to do with the size of their hands, just their inexperience and lack of understanding of the skill.