World's Top 4 Players In Action On Day 1 Of ATP Cup Defending champion Team Serbia to face Team Canada on Day 1 The match schedule for the 2021 ATP Cup, the 12-country event being played at Melbourne Park from 2-6 February, was released Monday. The tournament dates have been pushed back 24 hours to allow quarantined players the best possible preparation and training opportunities. Novak Djokovic, Rafael Nadal, Dominic Thiem and Daniil Medvedev will all begin their 2021 campaigns on Day 1 of the event. In the day session, defending champion Serbia will open its bid for a second straight title against Canada on Rod Laver Arena and Austria will face Italy on John Cain Arena.