Queenslander Leisel Jones broke a world record, but Ian Thorpe is in doubt for the rest of the World Cup swim meet after being forced out of his race with a bout of diarrhoea.

Thorpe withdrew from the men's 100m freestyle final after feeling ill, joining Grant Hackett on the sidelines.

The 11-time world champion had qualified eighth fastest for the event, winning his heat.

"He was suffering from diarrhoea and saw the doctor before the race, who advised him to pull out," Australian Swimming media manager Ian Hanson said.

Thorpe is scheduled to swim the 50m freestyle on Sunday, with Hanson saying Thorpe would make a decision either Saturday or Sunday whether he was well enough to compete.

Hackett, who collapsed poolside at Wednesday night's Qantas Skins meet in Sydney after suffering an asthma attack, withdrew from the 400m freestyle.

He is not expected to front for his other scheduled event at the meet - the 200m freestyle.

Thorpe's no-show overshadowed Jones' world record in the women's 100m breaststroke.

Jones, who already holds the 100m breaststroke longcourse record, added the shortcourse record, breaking Swede Emma Igelstrom's mark by two-hundredths of a second.

She swam 1min 05.09sec to beat fellow Australian Brooke Hanson (1:05.45) and American Amanda Beard (1:06.00).

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