Backdoor breaking ball

A breaking ball thrown to the outside of the strike zone of a left-handed hitter by a right-handed pitcher, or to a right-handed batter by a left-handed pitcher. Since most breaking balls curve toward the batter in this configuration, a backdoor breaking ball appears to be a ball, on the outside, then curves sharply into the strike zone after the batter has given up on it, coming through the "back door" of the strike zone. A backdoor slider is a common version of this pitch, since the slider has more lateral motion than other pitches.