Launceston's Ariarne Titmus has swum the fastest leg of the women's 4x200m freestyle relay at the FINA World Championships, setting up a gold medal win and breaking a 10-year-old world record.
Titmus, Madison Wilson, Brianna Throssell, and Emma McKeon won the relay with a time of 7:41.50.
It's the second gold for Titmus after beating out American Olympic champion Katie Ledecky in the 400m freestyle final on Sunday.
Swimming Australia said Titmus' performance was "one for the ages", setting a new Commonwealth and Australian record of 3:58.76.
Ledecky won silver with 3:59.97.
Titmus also took out silver in the 200m freestyle.
The women's relay team beat the United States, who came in with silver at 7:41.81, and Canada, who came in with bronze at 7:44.35.