Billy Wagner built a career on his 100-mph fastball. Wagner is one of the greatest relievers of all time, but the origin of his fastball almost sounds like a folk tale. Wagner is naturally right-handed, but he learned to throw lefty after breaking his right arm multiple times as a child. He was also short and threw around 80 mph in high school, so he didn't get any looks from Division 1 colleges. How did Billy Wagner manage to develop into a star?
