Apparatus for playing the game of tennis; articles for use in playing the games of tennis; grip bands for tennis rackets; natural gut strings for tennis rackets; natural gut strings for tennis racquets; rackets for playing tennis; sport bags adapted (shaped) to contain tennis rackets; strings for tennis rackets; tapes for wrapping tennis racquet handle grips; tapes with weights for balancing tennis racquets; tennis bags shaped to contain a racket; tennis ball serving machines; tennis ball throwing apparatus; tennis balls; tennis nets; tennis racket bags (shaped to contain a racket); tennis racket covers (shaped); tennis rackets; tennis racquets; tennis string protectors