Serbian Djokovic is defending champion after winning his record seventh Melbourne Park crown in last year's final against Rafa Nadal, who is the top seed this year and will face Bolivian Hugo Dellien as he aims for a 20th Grand Slam title.

American Serena Williams is only one Grand Slam title short of Australian Margaret Court's record of 24 and the eighth seed begins her bid for an eighth Melbourne Park crown with a tie against Russian Anastasia Potapova.

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Japan's Naomi Osaka, seeded third, won her second Grand Slam crown in Australia last year and starts her title defence against Czech Marie Bouzkova.

Rising American talent Coco Gauff plays twice champion Venus Williams, who she beat on her main draw Grand Slam debut at Wimbledon last year.

Only one man has won more major men's singles titles than Nadal and Swiss Roger Federer will open his search for a 21st with a first-round match against American Steve Johnson.

French Open champion Barty, the women's top seed and world number one, will be looking to end Australia's 42-year wait for a home champion since the unseeded Chris O'Neill won the title at Kooyong. (Reporting by Nick Mulvenney, editing by Shri Navaratnam)

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