Abstract: A one-piece, integral, molded, plastic, diaphragm-like grid designed for installation and tensioning bodily within the confines of the usual generally oval or elliptical frame of a tennis racket to supplant the conventional arrangement of interlaced racket strings. A series of small protuberances, disposed on opposite sides of the grid and arranged in checkerboard fashion enhance the frictional characteristics of the grid when the tensioned grid strikes a tennis ball during the playing of a game. An assembled tennis racket embodying such a grid.