The Australian women are the reigning Olympic and World champions and world-record holders in the 4x100m freestyle relay.
And they looked stronger than ever before on Tuesday.
Cate Campbell, Bronte Campbell and Emma McKeon all broke 53 seconds in the Australian Olympic Trials 100m freestyle final in Adelaide (52.38, 52.58. 52.80). No American has ever broken 53 seconds.
Brittany Elmslie finished fourth in 53.54 to round out the likely Rio Olympic final quartet.
“There are four women in the world who are swimming under 53 seconds, and three of them are not just from Australia, we all train in Queensland,” Cate said on Australian TV after the race.