NOVAK Djokovic put Roger Federer on notice as he won his 17th Grand Slam title at the Australian Open and warned he was going all-out for the Swiss’ record of 20 – and his mark for weeks as world number one.
Djokovic, who came through a mid-match slump to win his eighth title in Melbourne, is relentlessly totting up the victories that could soon end the debate over who’s the greatest in history.