ROME (Reuters) - Sweden's Sarah Sjostrom bettered the world record she set on Sunday to grab gold in the women's 100 metres butterfly final at the world swimming championships on Monday.
The 15-year-old surged home in 56.06 seconds, ahead of second-placed Jessicah Schipper of Australia and bronze medallist Jiao Liuyang of China.
Sjostrom destroyed the world record in Monday's heats to set a new mark of 56.44 but easily surpassed that on a warm Rome evening.
"I don't know what is happening right now. It's unbelievable," she told reporters. "This is my best year but I have many years in front of me. I can do better."
Six world records fell on Sunday's first day of competition. Critics have blamed hi-tech suits for the glut of records in recent months and governing body FINA is poised to ban non-textile suits from January and bring back trunks for men.
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