The ornamental design for a tennisrackethead, as shown and described.
FIG. 1 is a perspective view of a tennis racket head showing our new design.
FIG. 2 is front elevational view thereof, the opposite (rear) side being a mirror image thereof.
FIG. 3 is an enlarged fragmented view of the lower portion of the tennis racket head thereof; and,
FIG. 4 is a side elevational view of FIG. 2, the opposite side being a mirror image.
The broken lines in FIGS. 1-4, as well as the stringed portion of said racket head, are for illustrative purposes only and form no part of the claimed design.