World number ones Serena Williams, aiming to complete the first calendar-year Grand Slam in 27 years, and Novak Djokovic have been named the top seeds for the US Open championships starting on Monday in New York.
Williams, winner of the last three US women's singles crowns at Flushing Meadows, is followed on the seeding list by number two Simona Halep of Romania, a 2014 French Open finalist.
A victory for Serena Williams would make her the fourth woman to sweep all four Slams in a single season, joining Maureen Connolly (1953), Margaret Court (1970) and Steffi Graf (1988).
It would also be the American's seventh US Open singles crown, breaking her tie atop the all-time list with Chris Evert, and move her into a tie for second on the career grand slam singles list with Graf at 22, two behind Court.
Russia's Maria Sharapova, the 2006 US Open winner, is seeded third with 2014 US Open finalist Caroline Wozniacki of Denmark seeded fourth.
Other prominent women's seeds include fifth-seeded Czech Petra Kvitova, the 2011 and 2014 Wimbledon champion, followed at number six by compatriot Lucie Safarova, this year’s French Open finalist.
Victoria Azarenka of Belarus, a US Open finalist in 2012 and 2013, is seeded 20th. Twice US winner Venus Williams is seeded 23rd, 2011 champion Samantha Stosur of Australia is 22nd and 2004 US Open champion Svetlana Kuznetsova of Russia is seeded 30th.
Five-time US Open champion Roger Federer is the second seed for the men's event where the top-10 seeds feature five US Open champions and six Grand Slam winners in all.
In addition to 2011 champion Djokovic of Serbia and Switzerland's Federer (2004-08), former US champions include Andy Murray (2012), Rafael Nadal (2010, 13) and last year's winner, Marin Cilic of Croatia.
Scotland's Murray is seeded third, Spaniard Nadal is eighth and Cilic seeded ninth.
Kei Nishikori of Japan, runner-up last year to Cilic, is seeded fourth, one spot ahead of reigning French Open champion Stanislas Wawrinka of Switzerland.
The singles draws for the 2015 US Open will be made at the National Tennis Centre on Thursday.
