The International Tennis Federation (ITF) World Tennis Number is a new, single global tennis rating for all players, regardless of age, ability or gender. The USTA, along with over 135 other international governing bodies to-date, have adopted the ITF World Tennis Number.
The International Tennis Federation (ITF) is introducing a series of improvements to the World Tennis Number (WTN) to support the long-term sustainability of the system and ensure even greater accuracy for the growing global player community. These improvements will be introduced the week of August 10, 2026 and are based on feedback from players, coaches, providers and national associations.
For more information on these enhancements, please click here.
For a general overview of the WTN rating system and technical information, please click here.
Review the information below to learn about the relationship between WTN and adult players.
WTN Relation to other Ratings/Rankings for Adults
WTN Usage in USTA Adult Play
What is the relationship between USTA League and WTN?
Although WTN is not being used for USTA League play, all USTA league match results are included in the calculation of a player’s World Tennis Number. Adult League players will be able to track changes in their WTN week to week.
Can I file a Self-Rate NTRP Grievance based on my WTN?
No, self-rate NTRP grievances do not take into account a player's WTN.
WTN Relation to other Ratings/Rankings for Adults
Will the ITF World Tennis Number replace NTRP and are there any plans to use WTN in USTA League?
The USTA has no current plans to replace NTRP. The NTRP rating system will continue to serve as the foundation of the USTA Adult League program.
What are the main differences between NTRP and WTN?
There is no direct one-to-one comparison between NTRP and WTN due to many differences in each rating system. For instance:
- WTN and NTRP operate using two, distinct algorithms.
- The match results that make up a player’s Computer Rated (C) NTRP rating and WTN will not always be the same.
- WTN has a separate singles and doubles rating, while NTRP takes singles and doubles results into account for a single rating.
- NTRP and WTN handle mixed doubles matches differently.
- WTN ratings are calculated and published once per week, whereas NTRP is published once per year.
How does WTN rating differ from a USTA Ranking?
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 scores make up your WTN rating. Match scores are analyzed at set level. The algorithm takes into account each individual set as its own result.
How does the WTN differ from UTR?
WTN is an ITF product which is supported by the USTA and over 170 member nations.
ITF World Tennis number is the exclusive rating in the regulations for USTA Junior, ITA, and ITF competition. The WTN scale is 40 to 1, with 40 being the bottom of the scale and 1 being the top. UTR's scale is 1 to 16. WTN is updated weekly on Wednesdays, while UTR is updated daily.
For more information about UTR, please visit their website.