Where did the "sweeper" come from?
I'm 48 years old. Been a baseball fan my entire life. There have always been fastballls, changeups, knuckle balls, sinkers, splitters, cutters, sliders, curveballs, and the occasional screwball.
In the last few years I keep hearing broadcasters refer to "sweepers". What the hell is a sweeper, where did it come from, and how is it different than a slider?