A practice baseball constructed to curve to a controllable degree when thrown in the manner that a conventional baseball is thrown as a straight ball. The practice baseball is in major part spherical, the balance of the surface being a flat area resulting from the removal of a small segment. The practice baseball has all of the normal characteristics of any conventional similarly manufactured baseball of the same diameter and weight. The practice baseball may be of any selected weight and diameter between the limits recited hereinafter and more specifically, it will be of the same weight and diameter as that of any fully spherical baseball but of greater specific gravity resulting from the reduction in volume due to the removed segment. When hit with a conventional baseball bat, the practice baseball responds as to "crack" sound and the distance traveled like a conventional fully spherical baseball. The weight of the practice baseball is between 11/4 and 7 ounces and the major diameter of its spherical part is between 2 and 4 inches.
