Moscow: Former world number one Dinara Safina will not play again this year because of persistent back pain, the Russian said on Monday.
"I`m sorry to report that my back is still acting up and I will not be able to play until at least the end of the year," she said on her official website.
The 25-year-old, who has not played since early May, will miss her third successive grand slam tournament -- the U.S. Open -- after also pulling out of the French Open and Wimbledon.
The Muscovite has sounded pessimistic about her return to the main tour.
"I don`t know how long my time out is going to last because I don`t want to torture myself and my body anymore," the younger sister of former men`s world number one Marat Safin was quoted as saying by Russian media earlier this year.
Safina has been criticised for reaching the top without winning a grand slam title, losing all three of her major finals (French Open in 2008 and 2009 and 2009 Australian Open).
After missing much of last year, she made a comeback at the Australian Open in January but suffered an embarrassing 6-0, 6-0 defeat by Kim Clijsters in the opening round and soon after contemplated quitting the sport.