Australia's medal rush in the pool has commenced, with Emma McKeon's 4x100 metres freestyle relay team winning gold in dominant fashion on Sunday.
The squad broke their own world record, finishing three seconds clear of second-placed Canada. America was third.
McKeon was joined in the pool by Cate Campbell, Bronte Campbell and Meg Harris.
"Being part of this relay always lifts you," McKeon told Channel 7.
"Going out with the girls you always know you have that extra bit of adrenaline. I actually felt more relaxed going in with the rest of the team.
"Seeing the girls put up a really good heat swim and all six of us are part of this team, it's very exciting."
The early stages were tight, however Australia's depth allowed the team to steadily pull away as the event progressed.
In the end the race was between Cate Campbell and the world record line, such was the team's dominance.
The contest was in the balance when McKeon hit the water, the side 0.14 of a second ahead of Sweden at the midway point.
The race was over by the time she had touched the wall, the Illawarra talent producing a blistering split of 51.35 to hand Campbell a lead of more than two seconds with 100m to swim.
The four-time Olympian did the job with the anchor leg, ensuring the Australians would shave 0.36 of a second off the world record they set at the 2018 Commonwealth Games.
Australia has now won the event at three-straight Olympics, just the third time the nation has achieved the feat in any sport.
While Bronte and Emma were present in Rio, Cate has been there for all three and she said it was a special moment for her and the team.
"I could not be prouder of these girls," Campbell said. "It's been a tough ask for everyone to get here and to come away with the win and a world record, you honestly couldn't have asked for anything better."
The victory came after Brendon Smith won bronze in the men's 400m individual medley and Jack McLoughlin secured silver in the 400m freestyle.
While she produced an outstanding relay swim, McKeon was below her best in the 100m butterfly semi-finals, finishing second in a time of 56.33.
The swim was slower than her 55.82 in Saturday night's heat but enough to safely progress to Monday's final.
China's Yofei Zhang was fastest qualifier after taking out the second semi-final in a time of 55.89, ahead of Sweden's Sarah Sjoestroem.
McKeon will line up in lane six as the third seed in her bid to claim a second medal of the Olympics.