The first week of the international team competition features a group phase, with six groups of three countries, which play each other in a round robin format. One group in each city plays all its ties in the morning sessions while the other plays in the evening sessions.
In the 2023 edition, the group winners in each city play off in a city final for one of three semifinal spots. This city final is played in one day across a morning and an evening session. Of the three losing teams, one with the best record up to that point becomes the fourth semifinalist. For the 2024 edition, the six group winners along with the two best runners-up of each host city advanced to the quarterfinals.
There is a travel day allocated before the semifinals and final take place in Sydney.
In the 2023 edition, the final took place on one day. In case the tie's winner is decided after the singles matches, the mixed doubles match would not be played.
In the 2023 edition, each tie consisted of five matches, with two men's singles matches, two women's singles matches, and a mixed doubles match. For the 2024 edition, each tie consists of three matches (men's singles, women's singles and mixed doubles).
In the 2023 edition, each tie was split into two sessions played in different days, with two matches in the first day and three matches in the second day- In the 2024 edition, the three matches are held in the same day.
Qualification
18 countries qualify as follows:
- six countries based on the ATP ranking of their No. 1 ranked singles player
- six countries based on the WTA ranking of their No. 1 ranked singles player
- the final six countries based on the combined ranking of their number one ranked ATP and WTA players.
In exchange for being the host nation, Australia is guaranteed one of the spots reserved for teams with the best combined ranking if it fails to qualify on its own. [1]
In the 2023 edition, each player had three singles specialists and a doubles specialist for each gender. In the 2024 edition, each player has two singles specialists and a doubles specialist for each gender.
United States 
