As mentioned, the NTRP ratings is a skill-level rating system designed to ensure competitive matches by classifying players based on their abilities. It is primarily used in USTA League play, although other tennis organizations also use it. The ratings range from 1.0 (a beginner) to 7.0 (a professional player).
Self-rating
When players initially join USTA leagues, they self-rate according to the NTRP’s guidelines. These guidelines describe the general characteristics, skills, and abilities of players at each level, and players select the description that best fits their current ability level.
Dynamic Ratings
Self-rating is the beginning. USTA leagues and tournaments use a 'dynamic' rating system that takes into account players’ performances in matches. The rating of a player changes based on the outcome of each match and the rating of their opponents.
Beating a stronger opponent can raise a player’s dynamic rating, and losing to a weaker opponent can lower it. One match doesn’t significantly affect the dynamic rating. The rating is based on the performance in several matches.
Year-end Ratings
USTA publishes official NTRP ratings for players who have played enough matches at the end of each year. 'Year-end' ratings are based on a player’s dynamic ratings from the year. Year-end ratings determine a player’s league level for the next year.
Rating Appeals
Players can appeal their rating if they feel it doesn’t reflect their skill level. Appeals can be made for medical and non-medical reasons. Medical appeals are for players who have a permanent and significant injury or illness that affects their ability to play. Non-medical appeals are for players who dispute their year-end rating.