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
