ITF World Tennis Number (WTN)

For every match the WTN algorithm analyses each players' pre-match rating and predicts a winner. Each player’s WTN number will then change based on the score and how it compares to the prediction.

The more matches a person plays, the more effective the algorithm becomes, meaning players can feel confident that their number is accurate.

With numbers updated weekly, the WTN is continuously monitored and tested to ensure rankings are as accurate as possible, leading to more competitive matches.

NOTE: The confidence level will not be taken into consideration across Summer Interclub 2025/2026.

The Confidence Level is a measure of how accurate your rating is.

A Confidence Level of 70% and above indicates that the WTN is verified. There will be a tick beside the rating on the player profile (on the World Tennis Number website).
Initial WTN ratings are at a lower “Confidence Level” until more match results are recorded.

The Confidence Level can have a significant impact on a player’s rating. Faced with the same set of results, two players with the same rating, but with different Confidence Levels, will experience different rating updates. The player with a lower Confidence Level will see his/her rating fluctuate more.

As a guide, a verified WTN (70% and above) can be achieved by completing five or more matches in a consecutive five week period. There are instances where slightly more matches are required, such as if a player has had an extended time away from playing.

A player's confidence level falls with inactivity and after a year will be down to 10%.

It is important to consider that the WTN takes more into consideration when calculating a player’s WTN, therefore it is possible two players who were the same S or D grade, may have different WTNs.

Factors like:

- Confidence Level
- Match Scores
- Age and Gender

With all this in mind, we have randomly selected some active MatchHub players, and have displayed their WTN below.

Female Player #1 (Northland) - MatchHub Ranking = S6 - WTN = 26.5

Female Player #2 (Central) - MatchHub Ranking = S4 - WTN = 21.5

Female Player #3 (Central) - MatchHub Ranking = S6 - WTN = 27.0

Female Player #4 (Central) - MatchHub Ranking = S6 - WTN = 28.2

Female Player #5 (Central) - MatchHub Ranking = S8 - WTN = 28.7


Male Player #1 (Canterbury) - MatchHub Ranking = S4 - WTN =19.9

Male Player #2 (Auckland) - MatchHub ranking = S6 - WTN =24.4

Male Player #3 (Canterbury) - MatchHub Ranking = S8 - WTN = 28.1

Male Player #4 (Canterbury) - MatchHub Ranking = S8 - WTN = 28.5

Male Player #5 (Eastern) - MatchHub Ranking = S10 - WTN = 31.3

Yes, match results are analysed at set level, meaning the algorithm takes into account each individual set as its own result.

The WTN algorithm compares its score prediction with the actual score to determine what a player’s specific rating should be.

A retirement where a set has been completed does count toward a player’s WTN.

Around 80% of NZ players will now have a WTN.

A WTN will have been generated for Interclub players, as long as:

1. You have a date of birth associated with your current MatchHub grading.
2. You have played an Interclub match (or tournament) within the last three years.

Head to the MatchPoint WTN player list and type in your name. 

If you do see yourself, you will be able to see your singles and doubles WTN. You will be able to create a WTN account to be able to access the extra WTN website features.

If you need a hand with any of this, check out the guide here.

1. Your club interclub administrator can update this in the existing MatchHub website www.tennis.org.nz 
2. Your regional interclub administrator could also do this in either MatchHub or MatchPoint
3. If the above aren't possible, you are welcome to contact Matchpoint@tennis.kiwi via email and we'll update this for you.

Six years of interclub results were uploaded and run through the WTN algorithm to calculate initial WTNs for all players.

For a result to be sent to the ITF for WTN calculation, all participants must have a WTN. This could mean you have played with or against some opponents who have not yet got a WTN (likely from missing a date of birth in the system).

As more and more players receive a WTN, this will allow your match history to be submitted and you will notice more of your matches appearing on the WTN platform.

Yes, like our MatchHub grading is being replaced by the WTN, MatchHub is also being replaced by MatchPoint for interclub. There will be more information on this change communicated to you in the near future.

Once the change process has been completed, we will leave MatchHub tennis.org.nz available to view historic matches. We will display clear messaging that pushes people to the new platforms to see/use their current results.

MatchHub's S and D gradings will continue to be maintained/updated for the remainder of 2025.

During time periods in which a player does not compete, their WTN rating remains unchanged, but their confidence level decreases. This is the way the algorithm captures the increased uncertainty around a player’s rating.

Players who do not take part in competition for a significant period, caused by injury, off-court issues or other factors, will have a lower confidence level when they return to play.

The algorithm will react more strongly to the results as it tries to calibrate the player’s rating after a long absence of data.

It’s a tool for college coaches to use to evaluate prospective student-athletes worldwide.

Along with many of the world’s National Tennis Federations of note, the Intercollegiate Tennis Association in the USA (responsible for the administration of college tennis,) have announced the World Tennis Number as their official rating.

This will have flow-on effects for NZ players either currently involved in the college system or seeking college scholarships and highlights the importance of aligning with the global system that the World Tennis Number provides.

Click here for more info on this partnership here.

Yes. The ITF World Tennis number is a global system and as such any player who has competed abroad in a nation that also supports the ITF World Tennis Number will have one number which reflects all matches played at home and abroad.

Statistics to track your game, follow your friend’s and opponent’s progress, including viewing win/loss ratios and head-to-head comparisons.

Check it out here

The Game zONe identifies a range of potential opponents whose Numbers are close to yours on the scale.

Game zONe will find evenly-matched opponents wherever you are, to ensure the best possible experience on court
The industry-leading algorithm analyses player performance data and millions of match results.

For example - if your singles WTN is as shown here: 28.2, the WTN Game zONe predicts in order for your to have a competitive game, you’ll need to play someone between 31.2, and 25.2.

Player numbers have been based on historical match data from the last six years, ensuring each person has an accurate rating when the system launches.

Because each number is determined through a precise, objective and advanced mathematical formula, it won’t be possible to challenge or appeal the outcome.

The ITF World Tennis Number’s match predictions are more detailed than a simple win or loss. The system calculates the likelihood of various results and adjusts player numbers accordingly.

This means that no matter the relative level of the two players, if someone performs better than expected based on the prediction, their ITF World Tennis Number can still improve.

If your WTN hasn’t changed in the last two weeks and you’ve played matches, please contact the organiser of those tournaments. 

Click here to learn more about how your number is calculated. 

Click here to reach out to the WTN team support team.