ITF World Tennis Number

Developed by the International Tennis Federation, the world governing body of tennis, the ITF World Tennis number is a globally recognized rating system, and is adopted in over 170 countries, including the U.S.


The ITF World Tennis Number tools are live in Serve Tennis for tournament directors, coaches, and organizers to use for:


  • Seeding & Selection
  • Grouping & Flighting
  • WTN Tournaments
  • WTN Match Play

2023 WTN Match Play Promotion

Run a WTN Match Play event between September 20 and December 31, 2023, and receive an ITF WTN-branded Yeti tumbler, a case of balls, a duffel bag and 3 player hats. Plus, run 3 match play events or a 3-week session and qualify for an ITF WTN banner to display proudly at your facility.


WTN Match Play Basics:

  • Create a program on Serve Tennis and manage on USTA Serve app (Download for Apple and Android)
  • Singles round-robin and individual match formats with multiple scoring formats
  • Doubles individual matches with multiple scoring formats
  • Players can be grouped by ball color (green and yellow count for ITF WTN)


How to run a WTN Match Play event:

    Step 1: Fill out the WTN Match Play promotion interest form

    Step 2: Get set up in the USTA’s Serve Tennis platform    

    Step 3: Complete appropriate Safe Play requirements

    Step 4: Create your match play exactly how you want

    Terms and Conditions

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Free Tool

Free Tool


This advanced tool makes it easy to group based on level in programs, teams, and match play.

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Global Scale

Global Scale


It’s a 40-1 global scale. Players get one number for singles and one for doubles. Beginners start at 40 and professional tennis players will be closer to 1.

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Weekly Data

Weekly Data


Data updated weekly with millions of player match results across the U.S. and the world, which means more data points are analyzed to provide a current, reliable rating.

ITF World Tennis Number Scale

Each player has access to a personalized scale, which includes the GAMEzONe. GAMEzONe helps players identify a range of potential opponents whose numbers are of similar ability, ensuring the best possible experience on court! 

ITF World Tennis Number Tools in Serve Tennis and Tournament Desk

 ITF World Tennis Number Provider Tutorials

See below for tutorials on how to create a WTN Tournament in Serve Tennis and complete tournament selection in Tournament Desk using the ITF World Tennis Number.

Frequently Asked Questions

To access our full list of FAQs, visit customer care.

  • The ITF World Tennis Number provides a global standard for players. It is a 40-1 scale, with 40 being a beginner player and 1 being an elite professional. This scale is for all players, regardless of age, gender, or ability. Players will have a separate ITF World Tennis Numbers for singles and doubles.

  • The ITF World Tennis Number was developed by the International Tennis Federation (ITF). The ITF is the international governing body of tennis that works with national associations worldwide to support the growth of the sport

  • Participation in USTA and ITF tournaments, leagues, and match play will result in an ITF World Tennis Number. Players need match results in order to generate an initial rating. Players can expect their initial ITF World Tennis Number to be at a lower “Confidence level” until more match results are recorded.
  • The ITF World Tennis Number algorithm uses match result data as provided by the United States Tennis Association (USTA) to calculate your ITF World Tennis Number. Results provided by the USTA from as far back as 2016 can be used in calculating your rating. The more data used, the more accurate the rating. Pre-match ratings of both players are used by the algorithm to project the outcome of the match. Your ITF World Tennis Number changes depending on your match and how it compares to the projection. Current results carry more weight than older results. Over time, a result carries less and less weight in your rating calculation. Match results are analyzed at set level; the algorithm takes into account each individual set as its own result.
  • WTN Tournaments and Match Play
  • Selection and seeding in USTA Junior and Adult Tournaments
  • ITF acceptance
  • Collegiate Tennis
  • Junior Team Tennis
  • Player Development: Statistics to track your progress and help improve your game

  • Seeding, selection and flighting by ITF WTN in USTA, ITA and ITF-Tournaments

  • GameZone: Easily identify players at your level for closer matches, more fun and more improvement

  • Track favorite players, friends, professionals, local competition, and team comparisons

  • International system: Players from all over the world are using the ITF WTN

  • Match wins make up your USTA ranking. Ranking points are awarded by either points per round or points per win, depending on the tournament level. Match results, analyzed at the set level, make up your WTN rating.