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.
Williams' quarter also includes fourth-seeded Elina Svitolina and 13th-seeded Sloane Stephens, who won last year's U.S. Open but has lost all seven matches she's played since.
"I can't stop laughing outside and inside".
"I can't stop smiling on the outside and on the inside, it's such a great joy and I've missed it", Djokovic said. "I wanted to be back on court, unfortunately the elbow wouldn't let me last week".
Federer and Nadal's preparations for the Australian Open could not be more contrasting as the latter deals with an ongoing knee problem which continues to threaten his bid for a second Melbourne title and first since 2009, when he left the Swiss maestro weeping like a schoolboy on Rod Laver Arena.
"It feels great, obviously I was waiting for this moment for six months to play a match", the former World No.1 said after the win. "It's a great start". Six-time Australian Open champion Novak Djokovic, seeded 14th for this year's tournament, has a couple of potential early obstacles with American Donald Young and potentially mercurial Frenchman Gael Monfils in the second round. I won't put extra pressure on myself, regardless of who's going to play, or not play.
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Recently, Nadal made a rusty return from his injury-layoff as he slumped to a straight sets defeat to veteran Frenchman Richard Gasquet in the exhibition event at the Kooyong Classic in Melbourne.
"For now I'm in the tournament and let's hope with God's grace everything will be fine in the next five days".
However, he will share the lower part of the table alongside major contenders such as the Serbian Novak Djokovic, former leader of the universal ranking, the Argentine Juan Martin del Potro, the German Alexander Zverev and his compatriot Stan Wawrinka.
She said: "I have pain in my right adductor".
The 31-year-old beat Wawrinka in straight sets to win his ninth Roland Garros title in Paris, before Nadal beat South African Kevin Anderson in straight sets at the US Open in NY.
As mentioned above, Djokovic has triumphed at the Australian Open more time than any other male players.