A slider is a pitch in Baseball that breaks laterally and down. It is not thrown at the velocity that a fastball is thrown at, but its velocity is faster than a curve ball. The break on a slider is not as big as a curve ball. The slider is similar to a cut fastball, but will break more than a cut fastball.
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For all practical purposes, any baseball pitch that causes a strike is a good pitch ( bad hitters aside ). The pitch called the slider is a tricky pitch for many hitters. The main objective of a pitcher is to throw a pitch the hitter isn't expecting, and if it's s "strike" great. And, of course even a good hitter can lay wood on a pitch he's not expecting. Given all that, here's a perhaps typical situation. The pitcher is behind on the count, there are runners on base and this out is vital. Being behind on the count can (not always) call for a fastball. And here's where a pitcher with a good slider can take advantage. The best thing in many opinions is that the slider looks like a fastball to the hitter. A batter with a good eye can pick up a curve ball and pick it up early as by the pitcher's motion and the spin of the ball. And, a hanging curve ball anywhere near the strike zone is bad news for the pitcher.
Appearing as a fastball, the slider is deadly. It should spin and move like a real hummer. The surprise is when at the last moment it breaks off. The hitter ( if contact is made) will make contact not where he's expecting to and thus falls prey to the surprise.
A slider is a baseball pitch that breaks, or moves sideways and/or downward as it approaches the catcher. It is harder to catch and hit, and is often used to confuse batters.