BEFORE DOWNLOADING THE APP, PLEASE READ THE TERMS AND CONDITIONS OF USE HERE: https://www.itftennis.com/media/3412/rules-of-tennis-mobile-application-terms-and-conditions.pdf

The definitive rules of the game of tennis, as determined by the International Tennis Federation, the worldwide governing body for the sport. The app provides essential information on how the game should be played, and is recommended for everyone involved in tennis, from players, club owners and coaches, to tournament directors and officials. Includes specifications for the court, racket and ball, as well as information on marking out a tennis court. Includes recent changes to the Rules, as well as trials of new rules which have been approved by the ITF Rules of Tennis Committee.