>> that's pitching great tom glavine watching his son's little league practice. now you might be surprise at what he has it to say. >> i wouldn't let a kid at 11-year-old throw a breaking ball. i didn't throw a breaking ball until i got to high school. why does he say that? because the breaking ball, also called the curveball puts too much stress on preteen elbows. >> overtime, we're seeing an epidemic in overuse injuries in youth baseball. >> that often means surgery and pitching careers over before they've even started. >> i think at this jung age, teach teach them how to throw a fastball for strikes, teach them a change-up, just teach them how to pitch, don't worry about the curveball, there's plenty of time for that. >> reporter: the problem is young pitchers are also getting injured for throwing too much too many pitches each out. it's hard when professional baseball is such a draw. >> i want it be a professional baseball player.