Jodie Stimpson won for the first time in the World Triathlon Series to complete a dominant day for British competitors in Kitzbuehel, Austria.
The 24-year-old clocked one hour three minutes 22 seconds to finish 59 seconds ahead of second-placed Emma Jackson, from Australia.
Earlier in the day, Britain's Olympic champion Alistair Brownlee won the men's race in impressive style.
"I just had to give it a go and it worked out," said Stimpson.
Britons have now won both the men's and women's races at successive World Triathlon Series events, after Non Stanford and Jonny Brownlee, Alistair's younger brother, were victorious in Madrid in June.
Stimpson's success moves her into second place in the rankings, with German series leader Anne Haug third in Kitzbuehel.
"It is mum and dad's wedding anniversary on Sunday, so happy anniversary," said Stimpson.
"I knew on the run, going downhill was going to hurt my legs."
Stimpson claimed her first World Triathlon Series podium finish in Yokohama in May and followed that up with another third place in Madrid in June.
Her British team-mate Katie Hewison finished seventh in Kitzbuehel, with Vanessa Raw 15th and Stanford 16th.
Each winner of a World Series event gets 800 points, second place 740 and third 685, while higher points are on offer in the Grand Final, with the victor picking up 1,200 points.
The champion is decided based on competitors' best four World Series finishes plus their Grand Final result.