He missed warmup events in Abu Dhabi and Brisbane but appeared untroubled in an exhibition match win over Austrian world number five Dominic Thiem at Melbourne Park on Friday.
Nishikori will not be taking part due to a wrist injury that has made him inactive on the ATP Tour since last August in Montreal.
Six-time Australian Open victor Djokovic has been sidelined for six months with an injured right elbow, returning with a remodeled service motion, and 2014 champion Wawrinka has also been out of the game since Wimbledon after surgery on his knee. Yet nobody knows how any of this year's rusty sorts might function, or how those who have grabbed their formerly unattainable rankings will function with fresh pressure.
She found the outfit on the internet and hoped it would bring the same results in Australia.
While physical doubts remain, Djokovic hopes his enforced hiatus, during which he became a father for the second time, will mean the end to the mental struggles that dogged him during the second half of 2016 and first half of 2017.
Nadal also withdrew from the Brisbane International.
After sitting out most of 2017 tennis season with a career-threatening injury, former World No.1 Novak Djokovic has spent the last six months reassessing his serving technique.
Ashleigh Barty headlines the Aussie assault on day two in Melbourne
Wawrinka's participation came down to the wire, with the 2014 champion only deciding after practice on Saturday that he would commit to playing his first-round match against Ricardas Berankis.
Roger Federer distanced himself from favoritism for the Australian Open, highlighting his advancing age as the defending champion talked up the chances of world number one Rafael Nadal and six-time victor Novak Djokovic.
On the men's side, it's a couple of old guys-who played nothing like old guys in 2017-who stand as the two favorites: Rafael Nadal and Roger Federer.
Garbine Muguruza is the reigning Wimbledon champion, though her health has been in question. Halep, who has had back-to-back first-round exits on her last two trips to Melbourne Park, opens on day two against Australian wild-card entry Destanee Aiava.
The five-time major victor finished 2017 ranked number 60, meaning she missed out on a seeding for the Australian Open and could face 2016 champion Kerber in the third round.
With Serena Williams still absent, the women's draw is impossible to call. An aggressive baseliner, the 26-year-old Romanian won in Madrid, Bucharest and Montreal last season and reached four other finals including the French Open, where she lost an epic three-setter to Jelena Ostapenko.
Someone Lit Up The Trump Hotel With 'Sh*thole' And Poop Emojis
On Twitter, the President denied making derogatory remarks and said he has a "wonderful relationship with Haitians". The video projection was the work of artist Robin Bell , the founder of video projection company Bell Visuals .