Australia have smashed the world record in the final of the women's 4x100m freestyle relay, taking gold in a time of 3:29.69.
Three of the four women involved broke their own previous world record of 3:30.05, with teenager Meg Harris replacing Shayna Jack from that swim at the 2018 Commonwealth Games.
Bronte Campbell led the race off with her sister, Cate, providing the anchor leg - Harris and Emma McKeon provided the second and third swims, respectively.
"I could not be prouder of these girls," Cate Campbell said post-race.
"It's been a tough ask for everyone to get here and to come away with a win and world record, you honestly couldn't have asked for anything better."
They also beat the previous Olympic record, set by the Campbells, McKeon and Brittany Elmslie in 2016, by nearly a second.
Sweden and Great Britain provided some stiff competition over the first half of the race, but by the time McKeon was finished in a blistering time of 51.35, Australia had a clear lead that Cate Campbell was never a chance of surrendering.
McKeon's split was the fifth fastest 100m freestyle time in history.
The quartet were quick to praise Mollie O'Callaghan and Madison Wilson, who swam two legs of yesterday's heat before making way for Cate Cambpell and McKeon in the final.
"All six of us are part of this team," McKeon said.
"It's incredible, it's been a long time with this team and it's been one of my favourite memories, being part of the Australian team, being a part of this particular team," Bronte Campbell said after the race.
"There's no feeling like it," Harris added.
The Aussies finished more than three seconds ahead of the second-placed Canadians, who pipped the USA to silver by 0.03.
Australia has dominated the event in the 21st century, winning gold in Sydney, Athens, London, Rio, and now Tokyo, along with a bronze in Beijing.
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