The 48-year-old told a news conference on Friday that she gets annoyed when people think she's too old or that women's tennis is weak because she can still win matches at her age.

"Women's tennis is really strong," she growled.

"All I can say is I'm that damn good. I'm sorry but I really have to blow my own horn here -- I'm still that good."

Navratilova retired from singles in 1994 with 55 grand slam titles under her belt but then made a comeback to play doubles.

She has since won three grand slam mixed doubles titles and was so encouraged by her form she decided to resume playing singles.

The naturalised American won two of her seven matches, being knocked out in the first round of the French Open but reaching the second round at Wimbledon.

Navratilova has entered the doubles draw at the Australian women's hardcourt championship starting on the Gold Coast on Sunday and says she is considering playing singles later in the year.

"I might be playing some singles events this season depending on the surface," she said.