As you've probably noticed, baseballs are not as bouncy as basketballs or even golf balls. Bounciness depends on the construction and materials the ball is made out of.
Here is a link with some information about baseball bounciness, and how it affects the game of baseball ( ballbounces ).
Based on this resource, if you drop a baseball from 1 meter high, it will bounce back to 0.325 meters, or 32.5% of its original height. By contrast, a basketball will bounce back to 56% of its drop height.