Djokovic slammed the ATP schedule after his victory over Zverev at the season ending finals in London. Djokovic questioned the ATP schedule ahead of a big announcement from the governing body . Both of tennis' governing bodies, the International Tennis Federation and the ATP, are continuing to fight it out for supremacy in team competitions, with Davis Cup 2.0 – the brainchild of Barcelona centre-back Gerard Pique – and the ATP's new event the World Team Cup set to take place within six weeks of each other at the end of 2019 and the start of 2020.