Pitchers learn and develop different pitches, and they do so at varying stages of their lives. It might be a curveball in high school, a cutter in college, or a changeup in A-ball. Sometimes the addition or refinement is a natural progression — graduating from Pitching 101 to advanced course work — and often it’s a matter of necessity. In order to get hitters out as the quality of competition improves, a pitcher needs to optimize his repertoire.
Justin Dunn, Seattle Mariners
“I had a curveball before I had my slider. I learned it from my dad at 12 years old. He used to play in men’s leagues, and while he never played at a real high level, he loves the game. He’s a student of the game.
“Essentially, I take a two-seam grip and put my thumb underneath, finger through the lace, pressure to the ball.When I was younger, he would tell me to just throw it like a football, to never turn my wrist down. It would be big, loopy, and slow. As I got older, I started to throw harder and understand…