Teams

Group A

Germany

Alexander Zverev
Angelique Kerber

France

Lucas Pouille
Alize Cornet

Australia

Matt Ebden
Ashleigh Barty

Spain

David Ferrer
Garbine Muguruza

Group B

USA

Frances Tiafoe
Serena Williams

Switzerland

Roger Federer
Belinda Bencic

Greece

Stefanos Tsitsipas
Maria Sakkari

Great Britain

Cameron Norrie
Katie Boulter