Should Djokovic, a six-time victor at Melbourne Park, beat an as-yet-unknown qualifier, he could face wild card Jo-Wilfried Tsonga in the next match, with Denis Shapovalov a possible third-round opponent and Kei Nishikori potentially awaiting in the last eight.
The Spanish 22nd seed defeated Djokovic on his way to the title in Doha last week while concerns about Murray's fitness grew as he struggled through a practice match against world number one Djokovic at Melbourne Park today.
Third-seeded Caroline Wozniacki, who won her first Grand Slam title here a year ago after a tough final against Halep, is in the same section as Maria Sharapova and has Petra Kvitova at the top of her quarter.
World number one Novak Djokovic exposed Andy Murray's frailties in a practice match ahead of the Australian Open on Thursday (Jan 10), with the Scot calling it a day while losing 6-1, 4-1. But being so close, I'll give it a go. One more here would see him follow Jimmy Connors as the only man in the Open era to hit three figures, as well as taking him past Djokovic and Roy Emerson at Melbourne Park.
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Men's second seed Rafael Nadal opens against Australian James Duckworth, fourth seed Alexander Zverev starts against Slovenian Aljaz Bedene, and last year's runner-up Marin Cilic plays another local in Bernard Tomic.
"To finally get that (title) here was so special, it's the happy slam".
US Open champion Naomi Osaka is at four while Sloane Stephens, who also slumped out of Sydney early, is at five.
The supporter responded: 'Just seeing you out on court today was more than enough entertainment for me.
Murray, who missed most of last season after hip surgery, is 230th in the world and used his protected ranking to enter the first Grand Slam of the year.