I depends on your viewpoint, but the best basic breaking pitch is the "breaking ball" or curveball, but if you're looking to go fancy you can try the pitch made famous by Daisuke Matsuzaka the gyro ball. But if that's too fancy you can try the old knuckle ball.
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The pitch that made Mariano Rivera famous is the sharp breaking, cut fastball. It is known as a cutter.
A curveball falls under the general category of "breaking ball". A "breaking ball" refers to any pitch that is thrown with movement (i.e. a curveball, slider, sinker, etc.").
your best pitch. Mine is fastball low and away, but yours is probably different
The fastball. Its many varieties and easy control (as compared to a curveball or other breaking balls) make it a commonly used pitch.
Curve ball