I claim the ornamental design for a tennis ball novelty headwear, as shown and described.
FIG. 1 is a front elevation view of the tennis ball novelty headwear showing my new design;
FIG. 2 is a top plan view, thereof;
FIG. 3 is a left side elevation view, thereof;
FIG. 4 is another left side elevation view, thereof;
FIG. 5 is a rear elevation view, thereof;
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is a front perspective view, thereof.
The human head shown in broken lines in FIG. 3 forms no part of the claimed design and is included to illustrate the environment in which the design is used and assists in showing how the claimed design appears when worn.
The drawings are lined for the colors violet or grey.