Missing in the strike zone with secondary pitches is a cardinal sin for pitchers. However, for some prospects, learning to attack the zone with their breaking ball or changeup can be highly beneficial.
Throw strikes. It is the simple, yet effective mantra for pitchers of all ages. But eventually, the really good pitchers begin to learn secondary pitches such as sliders, curveballs and changeups. Suddenly, throwing strikes isn't as appealing anymore. From a young age, pitchers are taught that hanging, or leaving secondary pitches up in the zone is an easy way to give up extra base hits.