McKeown is the reigning Olympic champion in the women's 100m and 200m backstroke
Australian Kaylee McKeown has become the first woman to hold backstroke world records over 50m, 100m and 200m.
The 22-year-old reigning world champion over the three distances, set a new world's best over 50m at a World Cup event in Budapest, Hungary.
McKeown won her race in 26.86 seconds, beating the previous record of 26.98 set by China's Liu Xiang in 2018.
"I am super stoked. I never saw myself as a sprinter so it's nice to have that under my belt," said McKeown.
On Saturday, she also bettered her existing 100m record with a time of 57.33.
She won the 50m, 100m and 200m at this year's World Championships in Japan in July and is also the reigning Olympic champion over 100m and 200m.
Meanwhile, Britain's Adam Peaty was second as China's Qin Haiyang won the men's 50m breaststroke.
Qin also won the 100m on Friday, with Peaty fourth.
Peaty returned to competitive action for the first time since March earlier this month in Berlin, finishing third in the 50m breaststroke and sixth in the 100m with Qin again winning both races.
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