What are the GB National Rankings and how are they calculated?
There are 3 categories of national rankings: ITF Pro Circuit, ITF Junior Circuit and Tennis Europe. These rankings are used as orders of merit for tournament acceptance for GB players who do not have an ATP/WTA/ITF/TE ranking but want to compete in these international competitions. These lists are submitted to the ITF four times a year, after the ratings run appeals period has been completed after each ratings run.
The process of how the lists are compiled is detailed here.