Great Britain have been drawn against Rafael Nadal's Spain and Nick Kyrgios' Australia in the inaugural United Cup starting next month.
The mixed team event will take place in Brisbane, Perth and Sydney in the build-up to January's Australian Open.
British men's number one Cameron Norrie will play, but 2021 US Open women's champion Emma Raducanu has not entered.
The tournament, which runs from 29 December to 8 January, features 18 teams and $18m (£15m) in prize money.
Greece, led by men's world number three Stefanos Tsitsipas, are the top seeds, while women's world number one Iga Swiatek plays for second seeds Poland.