Text in Spanish. Mother Deuce: Tennis Etiquette and Rules of Play is for the young tennis player, age 3-10. It explains scoring, calling the lines, fair play, etiquette and sportmanship. Tennis scoring is difficult even for adults because it is different. The points are 15, 30, 40 and game. Learn about "add-in" and "add-out," tiebreakers, deuce and other tennis terms. Tennis is a sport that you can play for your entire life. You do not need a team of players, just two or four.