Teams

Group A

Germany

Alexander Zverev
Angelique Kerber

Canada

Vasek Pospisil
Eugenie Bouchard

Belgium

David Goffin
Elise Mertens

Australia

Thanasi Kokkinakis
Daria Gavrilova

Group B

Switzerland

Roger Federer
Belinda Bencic

USA

Jack Sock
CoCo Vandeweghe

Russia

Karen Khachanov
Anastasia Pavlyuchenkova

Japan

Yuichi Sugita
Naomi Osaka