The most common way pitchers tip is with their gloves. Different pitches are held differently in the throwing hand. A fastball is gripped with the index and middle finger on top of the ball, whereas a changeup is gripped more with the palm. Thus, the hand holding a changeup often makes for a wider hand in the glove. As a hitter, I’d observe from sixty feet away the glove get bigger, or flare, by just an inch or so with this widened changeup grip. The movement didn’t have to be drastic for me to pick it up and know what was coming.
