Sharapova out of US Open
Maria Sharapova has withdrawn from the US Open with a shoulder injury.
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The 2006 champion cited "right shoulder bursitis" as the reason.
She wrote on her Facebook page: "I just wanted to let you know that withdrawing from the US Open has been a really tough decision to make.
"I have done everything I could since Wimbledon to get myself ready but it just wasn't enough time. I have done many tests, received several opinions and it all comes down to taking the proper amount of time to heal my shoulder injury properly.
"It's certainly not an easy decision to make ahead of one of my favourite tournaments, but I know it's the right one that will get me back on the courts soon.
"I plan on taking the next few weeks off, receiving proper treatment and rehabilitation. I will miss being part of the US Open, but can't wait for next year!"
Sharapova was seeded third for the tournament, matching her current world ranking, despite having played just one match - a loss to Sloane Stephens in the opening round of the Cincinnati Open last week - since Wimbledon due to a hip injury.
After that match, Sharapova split from coach Jimmy Connors, who had only taken over from Thomas Hogstedt in July.
The draw for the US Open takes place later on Thursday, with the first round starting on Monday.
Organisers said that Anastasia Pavlyuchenkova would now be seeded 32nd with other seeds bumped up a place, making Agnieszka Radwanska the new number three seed and Sara Errani number four.
Briton Laura Robson is now the 30th seed.
A statement from US Open tournament director David Brewer said: "Maria has informed us that she will be unable to compete at the US Open this year due to a right shoulder bursitis and has withdrawn from the tournament. We wish her a speedy recovery and look forward to her return to New York next year."
Sharapova has suffered with shoulder injuries in the past, missing nine months after surgery in 2008. Prior to that surgery she had won Wimbledon in 2004, the US Open in 2006 and the Australian Open in 2008.
She won a fourth Grand Slam tournament with victory at the French Open last year.
Revised US Open women's singles seedings:
1. Serena Williams, United States
2. Victoria Azarenka, Belarus
3. Agnieszka Radwanska, Poland
4. Sara Errani, Italy
5. Li Na, China
6. Caroline Wozniacki, Denmark
7. Petra Kvitova, Czech Republic
8. Angelique Kerber, Germany
9. Jelena Jankovic, Serbia
10. Roberta Vinci, Italy
11. Samantha Stosur, Australia
12. Kristen Flipkins, Belgium
13. Ana Ivanovic, Serbia
14. Maria Kirilenko, Russia
15. Sloane Stephens, United States
16. Sabine Lisicki, Germany
17. Dominika Cibulkova, Slovak Republic
18. Carla Suarez Navarro, Spain
19. Sorana Cirstea, Romania
20. Nadia Petrova, Russia
21. Simona Halep, Romania
22. Elena Vesnina, Russia
23. Jamie Hampton, United States
24. Ekaterina Makarova, Russia
25. Kaia Kanepi, Estonia
26. Alize Cornet, France
27. Svetlana Kuznetsova, Russia
28. Mona Barthel, Germany
29. Magdalena Rybarikova, Slovak Republic
30. Laura Robson, Great Britain
31. Klara Zakopalova, Czech Republic
32. Anastasia Pavlyuchenkova, Russia