It means that she has now matched the feat achieved in 2014 by Gwen Jorgensen of the United States, who won the Olympic title last summer.

The 29-year-old Bermudan finished in 2 hours 9sec, almost a minute-and-a-half clear, to go into next month's Rotterdam Grand Prix Final as the overall series leader.

She boasts a score of 4,000 points as she seeks to retain her title.

Britain's Jessica Learmonth earned her first WTS medal as she finished second in the penultimate event of the 2017 season in 2:01.30, with Ashleigh Gentle of Australia third in 2:01.42.

In the men's race, event favourite and overall Series leader Mario Mola of Spain had to settle for seventh place on a day when Britain's Jonathan Brownlee, fourth in his last two WTS events, got back into winning ways as he came home in 1:49.10.

"I was very happy with today to execute a solid race in the swim, bike and run," said Duffy.

"My swim has been a little shakier this year so it was nice to come out third behind Jess [Learmonth] and Lucy [Hall], it was a perfect position.

"And then onto the bike we were hammering on that first lap to create a gap and that kind of set the race up perfectly."

Speaking of her position before Rotterdam, she added: "That is the reason that I came here, I had five pretty good scores before today, but you never know what is going to happen.

"With the Grand Final being points and a half you kind of want to go in there with the biggest buffer that you can to make sure you can absolutely give yourself the world title."

Britain's Jodie Stimpson lined up in the Swedish capital to compete in her first WTS race back from injury since Gold Coast in April.

While she had an excellent swim that left her only 15 seconds back from the leaders and a chance to make the lead bike pack, an early start from the pontoon doomed her with a 15-second penalty which she was forced to serve during transition.

The first few laps of the bike saw Duffy, Learmonth and Katies Zaferes of the US push on, but the latter competitor crashed out of the race on a tight corner during the third lap.

Duffy then sprinted off on the run, leaving Learmonth alone to battle for a place on the podium.

The Bermudan gained ground during the 10-kilometre course, entering the blue carpet with plenty of time to spare.

The men's race saw Kristian Blummenfelt of Norway earn second place in a photo-finish with France's Pierre Le Corre, with both men being credited with a time of 1:49.28.

Mola finished 20 seconds back from them but, like Duffy, knew that he would go on to the Grand Final as overall series leader regardless of today's result.