Group A

Serbia (Novak Djokovic, Dusan Lajovic)
Germany (Alexander Zverev, Jan-Lennard Struff)
Canada (Denis Shapovalov, Milos Raonic)

Group B

Spain (Rafael Nadal, Roberto Bautista Agut)
Greece (Stefanos Tsitsipas, Michail Pervolarakis)
Australia (Alex de Minaur, John Millman)

Group C

Austria (Dominic Thiem, Dennis Novak)
Italy (Matteo Berrettini, Fabio Fognini)
France (Gael Monfils, Benoit Paire)

Group D

Russia(Daniil Medvedev, Andrey Rublev)
Argentina (Diego Schwartzman, Guido Pella)
Japan (Kei Nishikori, Yoshihito Nishioka)