The second edition of the ATP Cup team event gets underway on the Australian Open grounds in Melbourne on Tuesday.

Despite the reduced field — countries cut from 24 to 12 — the 5-day event is star-powered with 15 of the Top 17 in action including Novak Djokovic, Rafael Nadal, Daniil Medvedev, Andrey Rublev, Denis Shapovalov, Alexander Zverev, Gael Monfils, Dominic Thiem and Kei Nishikori.

The 12 countries have been split into four groups of three led by the defending champion Serbia.

GROUP A
Serbia – Novak Djokovic, Dusan Lajovic, Filip Krajinovic, Nikola Cacic
Germany – Alexander Zverev, Jan-Lennard Struff, Kevin Krawietz, Andreas Mies
Canada – Denis Shapovalov, Milos Raonic, Peter Polansky, Steven Diez

GROUP B
Spain – Rafael Nadal, Roberto Bautista Agut, Marcel Granollers, Pablo Carreno Busta
Greece – Stefanos Tsitsipas, Michail Pervolarakis, Markos Kalovelonis, Petros Tsitsipas
Australia – Alex de Minaur, John Millman, John Peers, Luke Saville

GROUP C
Austria – Dominic Thiem, Dennis Novak, Philipp Oswald, Tristan-Samuel Weissborn
Italy – Matteo Berrettini, Fabio Fognini, Simone Bolelli, Andrea Vavassori
France – Gael Monfils, Benoit Paire, Nicolas Mahut, Edouard Roger-Vasselin

GROUP D
Russia – Daniil Medvedev, Andrey Rublev, Aslan Karatsev, Evgeny Dosnkoy
Argentina – Diego Schwartzman, Guido Pella, Horacio Zeballos, Maximo Gonzalez
Japan – Kei Nishikori, Yoshihito Nishioka, Ben McLachlan, Toshihide Matsui

The four top countries in each group will emerge to the semifinal knock-out round on Friday.

The tournament runs from Tuesday through finals day on Saturday. On Tuesday, Djokovic meets Shapovalov, Nadal-De Minaur, Thiem-Berrettini, Medvedev-Schwartzman.

Players can earn a maximum of 500 ATP ranking points. On court coaching is again allowed.