ATP CUP SQUADS:
Serbia (Novak Djokovic, Dusan Lajovic, Filip Krajinovic, Nikola Cacic)
Spain (Rafael Nadal, Roberto Bautista Agut, Marcel Granollers, Pablo Carreno Busta)
Austria (Dominic Thiem, Dennis Novak, Philipp Oswald, Tristan-Samuel Weissborn)
Russia (Daniil Medvedev, Andrey Rublev, Aslan Karatsev, Evgeny Donskoy)
Greece (Stefanos Tsitsipas, Michail Pervolarakis, Markos Kalovelonis, Petros Tsitsipas)
Germany (Alexander Zverev, Jan-Lennard Struff, Kevin Krawietz, Andreas Mies)
Argentina (Diego Schwartzman, Guido Pella, Horacio Zeballos, Maximo Gonzalez)
Italy (Matteo Berrettini, Fabio Fognini, Simone Bolelli, Andrea Vavassori)
Japan (Kei Nishikori, Yoshihito Nishioka, Ben McLachlan, Toshihide Matsui)
France (Gael Monfils, Benoit Paire, Nicolas Mahut, Edouard Roger-Vasselin)
Canada (Denis Shapovalov, Milos Raonic, Peter Polansky, Steven Diez)
Australia (Alex de Minaur, John Millman, John Peers, Luke Saville)
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