Chiasso, Switzerland, 19 April 2013 | AAP

Sam Stosur will lead Australia into battle against Switzerland after declaring herself fit for the high-pressure Fed Cup clash starting on Saturday.

Stosur has been troubled by a calf problem in the lead-up to the World Group Play-off tie in Chiasso, which Australia needs to win to keep a spot in the world’s top eight.

But the 29-year-old says she’s as ready as she can be and has been drawn to contest the crucial first singles match against Swiss No.2 Stefanie Voegele on clay.

Jarmila Gajdosova will face top-ranked Swiss Romina Oprandi in the second singles match on Saturday with captain Alicia Molik sticking with the same combination that fell to the Czech Republic in February.

Casey Dellacqua and Ashleigh Barty will team up for doubles on Sunday.

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Stosur first suffered her injury at Indian Wells last month and the lingering problem is causing concern ahead of her French Open build-up.

However, she’s looking forward to putting it to the test in the southern Swiss city.

“It’s one of those things where you’ve just got to play it by ear and take it day by day but so far so good,” Stosur told AAP on Friday.

“I feel like I’ve done everything I can to be prepared for this weekend so we’ll go out there and give it 100 per cent. It’s just now more trusting it and getting court time and getting comfortable again.”

Stosur should have a mental edge over Voegele, having defeated her in Australia’s triumph over Switzerland in the World Group II first round last year.

The Australians have only lost once to the Swiss in six ties but the strong record hasn’t stopped Molik’s side doing its homework.

“We’re really aware of their (playing) styles,” Molik said.

“This week hasn’t just been about training on court. It’s also been about fact finding about our opponents and we are spending more time on that as a Fed Cup team.”

Gajdosova’s selection for singles comes despite being the lowest ranked of Australia’s four team members at No.197.

“Her quality of play this week has been of an extremely high standard,” Molik said.

You can follow all the Fed Cup lead-up on Twitter at @TennisAustralia.

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