Top-ranked Novak Djokovic and Simona Halep, as expected, were given the No. 1 seedings on Thursday, 10 January, when the Australian Open announced its singles seedings list.
Defending champion Roger Federer is seeded No. 3 after Rafael Nadal, while women's defending singles champion Caroline Wozniacki, who beat Halep in last year's final at Melbourne Park, is No. 3 behind second-seeded and 2016 champion Angelique Kerber.
Serena Williams, who won the Australian Open in 2017 while pregnant with daughter Alexis Olympia, returns as the 16th-seeded player after missing last year's tournament.
Fifth-ranked Juan Martin del Potro will miss the Australian Open while he recovers from a fractured right kneecap.
1. Novak Djokovic, Serbia
2. Rafael Nadal, Spain
3. Roger Federer, Switzerland
4. Alexander Zverev, Germany
5. Kevin Anderson, South Africa
6. Marin Cilic, Croatia
7. Dominic Thiem, Austria
8. Kei Nishikori, Japan
9. John Isner, United States
10. Karen Khachanov, Russia
1. Simona Halep, Romania
2. Angelique Kerber, Germany
3. Caroline Wozniacki, Denmark
4. Naomi Osaka, Japan
5. Sloane Stephens, United States
6. Elina Svitolina, Ukraine
7. Karolina Pliskova, Czech Republic
8. Petra Kvitova, Czech Republic
9. Kiki Bertens, Netherlands
10. Daria Kasatkina, Russia
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