Payers and Players Research and Discovery – Détails, épisodes et analyse

Tennis balls may look simple, but for pros, the differences in brands and quality affect performance, sparking heated complaints. Now, the ATP is stepping in to streamline the selection process, aiming to reduce injuries and bring consistency back to the courts.

ABSTRACT

Assessing relative player skill is important in many aspects of tennis. In 2008, the Universal

Tennis Rating (UTR) was introduced as a global tennis player skill rating that put all players,

regardless of gender, age or geographic location, on a common scale. The International

Tennis Federation (ITF) recently launched a competitor rating called the World Tennis

1/18Number (WTN). The purpose of this paper is to provide evidence on which rating is a

superior measure of player skill. We assume better skilled players are more likely to win

tennis matches and examine whether UTR or WTN ratings better predict head-to-head

match success using 1,532 matches played by 870 participants at the 2022 United States

Tennis Association (USTA) Junior National Championships. We observe classification

accuracy of 73.9% and 70.4% for UTR and WTN ratings, respectively. Both classification

accuracy levels are statistically greater than chance and approximate the accuracy level

observed for bookmakers at the professional level. UTR and WTN rating classification

accuracy does not statistically differ between ratings in the sample overall, by age division,

by gender, by match format, or by the magnitude of player rating differences. We conclude

that UTR and WTN ratings are equivalent measures of player skill based upon their ability to

predict match outcomes. These findings provide initial empirical evidence important to tennis

organizations making rating adoption decisions, tennis coaches seeking play parity,

tournament directors seeding players and college coaches screening potential recruits. We

provide mapping functions between UTR and WTN ratings for situations where players have

one rating but not the other.

Keywords: Universal Tennis Rating (UTR), World Tennis Number (WTN), junior tennis,

match forecasting, classification accuracy

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