Wimbledon champion Garbine Muguruza and world No. 6 Karolina Pliskova are joint favorites at $8 to lift the Daphne Akhurst Memorial Cup for the first time.
"I worked hard in the off-season and I'm changing some things but I know that will take time".
The Spaniard will be followed by last year's champion and his long time rival on court and great friend of it, Roger Federer as the 2nd seed for the event.
In a statement on Snapchat, she wrote: "After performing in my first match after giving birth I realised that although I am super close I'm not where I personally want to be".
Sixth-ranked Cilic said he needs only a few more days of training to be ready for the start of the Open at Melbourne Park.
Danger lurks at nearly every corner, with former Wimbledon finalist Milos Raonic and a resurgent Juan Martin Del Potro, the man who beat Federer for the 2009 U.S. Open title, looming as threats before the quarter-finals.
The Serb, himself struggling with an elbow injury that ended his 2017 season at Wimbledon, admitted he is not yet fully fit and does not see himself as a top contender when the tournament begins on Monday.
The five-time major victor finished 2017 ranked No. 60, meaning she missed out on a seeding for the Australian Open and could face 2016 champion Kerber in the third round.
He was far from his best against world No. 31 Gasquet, but it was a big step forward as he targets a second Australian Open title.
"There's no easy way to get to the top", Sharapova told the crowd at Margaret Court Arena before the draw. "He's a friend of mine and it's great to play him", he said."I'm happy with how I'm playing after a test against Rafa, who along with Federer is the best in history".
It has meant some alterations to the draw, but tournament director Peter Johnston said it was worthwhile.
Five-times runner-up Andy Murray and Japan's Kei Nishikori will take no part, with Murray's hip injury casting a huge cloud over the former world number one's career. "For me it was not ideal to not be in Brisbane, I would have loved to be there but I had to make a different schedule this year", Nadal said during the week.
Djokovic continued: "I'm still not 100 per cent".