Originally Posted by dougdirt
Technically, all pitches 'break' downward. Gravity makes that happen unless you are throwing submariner. A secondary pitch is anything not a fastball.
Change ups aren't straight, though they generally don't move much more than one's fastball, they sink an extra 2-3 inches and have 2-3 inches of extra run, on average.
A breaking ball is a curve or slider (or slurve).
While we are on this subject, can you differentiate between a cut FB (or cutter), a screwball, and a split finger pitch. It seems to me that everyone throws a cutter these days, while the other two terms are seldom used anymore.