The WTA said Friday that representatives of Hingis had confirmed the Swiss world number four would not be submitting an application to play in the final Grand Slam of the year by the July 15 deadline.

Hingis, the 1997 U.S. Open winner, is recovering from a troublesome left ankle injury but said she could play at Flushing Meadows thanks to an invitation if she is declared fit for the tournament, which starts on Aug. 26.

"I've chosen to leave things alone because I don't want to set a fixed date for my return to competitive tennis," Hingis told Swiss Sunday newspaper Sonntags Zeitung.

"But the possibility that I can play in Flushing Meadows is realistic enough. I still have over five weeks for preparation and surely there is a possibility I can play in New York."

Hingis' injury has kept her out of the French Open and Wimbledon and she has also pulled out of a number of tournaments in the lead-up to the U.S. Open.

But Hingis added: "The recovery of my ankle injury is going satisfactorily and I can more or less play tennis twice a day."

Hingis has won five Grand Slam titles and reached the final of the Australian Open earlier this year, but lost to defending champion Jennifer Capriati.