FIG. 1 is a top, front, left perspective view of a hitch ball assembly showing my new design;
FIG. 2 is a top, rear, left perspective view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof; and
FIG. 7 is a front view thereof; and,
FIG. 8 is a rear view thereof.
The broken lines of FIGS. 1, 2, 3, 4, and 6 are included for the purpose of illustrating environment and form no part of the claimed design.