Biggest names out in the available teams: Alcaraz Djokovic Gauff Bautista Sinner Muguruza Cilic Krejcikova Pliskova Raducanu Murray (Serbia also out)
Several notable players won't be taking part in the first edition of the United Cup such as Alcaraz, Djokovic, Gauff, Raducanu and Murray.
The event will replace the ATP Cup in the calendar this year as the mixed teams' format makes the return. It was popularized in the past as the Hopman Cup and it will make a return this year with a superb format featuring 18 nations.
Novak Djokovic won't be there as he still doesn't know whether he can enter the country but also Serbia is not taking part anyway. Emma Raducanu and Andy Murray are not playing which is somewhat strange as they both expressed interest in playing together.
Coco Gauff is not in the US team with Carlos Alcaraz not being in the Spanish team despite Nadal signing up for the event. Check out the full rosters below.
Biggest names out in the available teams: Alcaraz Djokovic Gauff Bautista Sinner Muguruza Cilic Krejcikova Pliskova Raducanu Murray (Serbia also out)