Novak Djokovic fires Roger Federer and Rafael Nadal warning ahead of Australian Open

NOVAK DJOKOVIC has warned Roger Federer and Rafael Nadal that he still has a couple more gears to shift through as he vows to break another record at the Australian Open.

from Daily Express :: Tennis Feed https://www.express.co.uk/sport/tennis/1067047/Novak-Djokovic-Roger-Federer-Rafael-Nadal-Australian-Open-tennis-Hopman-Cup-Qatar-Open
via Express