Spain's Rafael Nadal and Jelena Jankovic of Serbia have been confirmed as the top seeds for this year's Australian Open, which begins on Monday.
Roger Federer was listed as second seed in the men's draw ahead of defending champion Novak Djokovic and Briton Andy Murray for the year's first Grand Slam.
Former champion Serena Williams was seeded second for the women's tournament ahead of Russian pair Dinara Safina and Elena Dementieva.
The full draw for the tournament will be made at Melbourne on Friday. Seeds for the Australian Open are based on the world rankings.
The only man missing from the world's top 32 is Russian Nikolay Davydenko while two women are absent, last year's champion Maria Sharapova and China's Li Na.
Nadal has never won the Australian Open although he has won the French Open four times and Wimbledon once. His best performance in Melbourne was last year when he reached the semi-finals.
Jankovic was also a semi-finalist in Australia last year but is yet to win a grand slam.
List of seeded players
MEN:
1. Rafael Nadal (Spain)
2. Roger Federer (Switzerland)
3. Novak Djokovic (Serbia)
4. Andy Murray (Britain)
5. Jo-Wilfried Tsonga (France)
6. Gilles Simon (France)
7. Andy Roddick (U.S.)
8. Juan Martin Del Potro (Argentina)
9. James Blake (U.S.)
10. David Nalbandian (Argentina)
11. David Ferrer (Spain)
12. Gael Monfils (France)
13. Fernando Gonzalez (Chile)
14. Fernando Verdasco (Spain)
15. Stanislas Wawrinka (Switzerland)
16. Robin Soderling (Germany)
17. Nicolas Almagro (Spain)
18. Igor Andreev (Russia)
19. Marin Cilic (Croatia)
20. Tomas Berdych (Czech Republic)
21. Tommy Robredo (Spain)
22. Radek Stepanek (Czech Republic)
23. Mardy Fish (U.S.)
24. Richard Gasquet (France)
25. Ivo Karlovic (Croatia)
26. Marat Safin (Russia)
27. Feliciano Lopez (Spain)
28. Paul-Henri Mathieu (France)
29. Dmitry Tursunov (Russia)
30. Rainer Schuettler (Germany)
31. Jurgen Melzer (Austria)
32. Philipp Kohlschreiber (Germany)
WOMEN:
1. Jelena Jankovic (Serbia)
2. Serena Williams (U.S.)
3. Dinara Safina (Russia)
4. Elena Dementieva (Russia)
5. Ana Ivanovic (Serbia)
6. Venus Williams (U.S.)
7. Vera Zvonareva (Russia)
8. Svetlana Kuznetsova (Russia)
9. Agnieszka Radwanska (Poland)
10. Nadia Petrova (Russia)
11. Caroline Wozniacki (Denmark)
12. Flavia Pennetta (Italy)
13. Victoria Azarenka (Belarus)
14. Patty Schnyder (Switzerland)
15. Alize Cornet (France)
16. Marion Bartoli (France)
17. Anna Chakvetadze (Russia)
18. Dominika Cibulkova (Slovakia)
19. Daniela Hantuchova (Slovakia)
20. Amelie Mauresmo (France)
21. Anabel Medina Garrigues (Spain)
22. Zheng Jie (China)
23. Agnes Szavay (Hungary)
24. Sybille Bammer (Austria)
25. Kaia Kanepi (Estonia)
26. Ai Sugiyama (Japan)
27. Maria Kirilenko (Russia)
28. Francesca Schiavone (Italy)
29. Alisa Kleybanova (Russia)
30. Aleksandra Wozniak (Canada)
31. Alona Bondarenko (Ukraine)
32. Tamarine Tanasugarn (Thailand)