[troutman]

https://en.wikipedia.org/wiki/ATP_Cup

The ATP Cup is an international outdoor hard court men's tennis tournament between competing nations, which will premiere in January 2020. The tournament will be played across three Australian cities over ten days in the lead up to the Australian Open and will feature teams from 24 countries.

The event sees the return of an ATP team competition into the calendar for the first time since the ATP World Team Cup, which was held in Düsseldorf from 1978 to 2012. The inaugural tournament is scheduled to take place between 3 and 12 January 2020, being played in Sydney, Brisbane and Perth. Sydney will host the finals of the competition for the first three events between 2020 and 2022.

The format saw 24 teams divided into six groups of four teams each. The teams will face in ties composed of two singles match and one doubles match. The match between the No. 2 of each team will open the tie, then the No.1 of each team, and the doubles match closing the tie. The doubles match will be played regardless whether the tie is decided or not.