The ornamental design for a combinedbelt and tennisball holder, as shown and described.
FIG. 1 is a front perspective view of the combined belt and tennis ball
holder showing my new design;
FIG. 2 is a rear perspective view thereof; and
FIG. 3 is a partial perspective view of a ball pocket with a ball shown in
broken lines and portions of the belt broken away for convenience of
illustration.