American teenager Katie Ledecky has sliced 2.86 seconds off her 800m freestyle world record, clocking 8m11.00s at a meet in Texas for her second world record in four days.
The 17-year-old Ledecky improved on her own previous 800m free world record of 8:13.86 set at the world championships in Barcelona in August of last year.
On Thursday night, Ledecky had shattered her previous record in the 1500m free with a time of 15:34.23, improving on the mark of 15:36.53 she had set in Barcelona.
Ledecky is the Olympic champion in the 800m free. The women's 1500m free isn't contested in the Olympics, although it is a world championships event for both men and women.
Ledecky is in strong form with the US Championships in Irvine, California, looming in August.
Those championships are a selection meeting for the Pan Pacific Championships in Australia later that month, as well as the 2015 world championships in Russia.
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