Clijsters is seeded No. 12, one of the Williams, was unable to defend his Australian title year last because of persistent injuries. Williams lost only twice at Melbourne Park since won this title in 2003 - missing tournaments in 2004 and 2011 and five times the title win.
The draw of the 2012 tournament will take place Friday morning.
Seeds for men:
1 Novak Djokovic, Serbia
2 Rafael Nadal, Spain
3 Roger Federer, Switzerland
4 Andy Murray, United Kingdom
5 David Ferrer, Spain
6 Jo-Wilfried Tsonga, France.
7 Tomas BERDYCH, Czech Republic
8 Mardy fish, United States of America
9 Benneteau, Serbia
10 Nicolas Almagro, Spain
11 Juan Martin del Potro, Argentina
12 Gilles Simon, France
13 Alexander Dolgopolov, Ukraine
14 Gael Monfils, France
15 Andy Roddick, United States of America
16 John Isner, United States of America
17 Richard Gasquet, France
18. Feliciano Lopez, Spain
19 Viktor Troicki, Serbia
20 Florian Mayer, Germany
21 Stanislas Wawrinka, Switzerland
22 Fernando Verdasco, Spain
23. Miloš Raonic, Canada
24 Kei Nishikori, Japan
25 Juan Mónaco, Argentina
26 Marcel Granollers, Spain
27 Juan Ignacio Chela, Argentina
28 Ivan Ljubicic, Croatia
29 Radek Stepanek, Czech Republic
30 Kevin Anderson, South Africa
31 Jürgen Melzer, Austria
32 Alex Bogomolov Jr., Russia.
Seeds of women
1 Caroline Wozniacki, Denmark
2 Petra Kvitová, Czech Republic
3 Victoria Azarenka, Belarus
4 Maria Sharapova, Russia
5 Li Na, China
6 Sam Stosur, Australia
7 Vera Zvonareva, Russia
8 Agnieszka Radwańska, Poland
9 Marion Bartoli, France
10 Andrea Petkovic, Germany
11 Francesca Schiavone, Italy.
12 Kim Clijsters, Belgium
13 Serena Williams, United States of America
14 Jelena Jankovic, Serbia
15 Sabine Lisicki, Germany
16 Anastasia Garbin, Russia
17 Shuai Peng, China
18. Dominika McLeod, Slovakia
19 Svetlana Kuznetsova, Russia
20 Flavia Pennetta, Italy
21 Daniela Hantuchova, Slovakia
22 Ana Ivanovic, Serbia
23 Julia Görges, Germany
24 Roberta Vinci, Italy
25 Lucie Safarova, Czech Republic
26 Kaia Kanepi, Estonia
27 Anabel Medina Garrigues, Spain.
28 Maria Kirilenko, Russia
29 Yanina Wickmayer, Belgium
Nadia Petrova, Russia 30
Angelique Kerber, Germany 31
32 Monica Niculescu, Romania.