Developed by the International Tennis Federation (ITF), the ITF World Tennis Number (WTN) is a rating that provides a global standard for players in both singles and doubles with a scale of 40-1. WTN Match Play allows players to participate in matches that count towards their WTN without having to commit to a tournament. Players can be placed in groups based on their rating to promote an appropriate competitive level and positive sportsmanship through level-based play. Please note that WTN Match Play is offered in orange, green, and yellow ball programs, but orange ball does not count towards WTN.