Alicia Coutts set a new Commonwealth and Australian record in the women's 100m individual medley at the Australian short course championships in Sydney on Saturday.
The five-time Olympic medallist won her fourth gold at the meet when she recorded a time of 57.71sec for an emphatic victory ahead of defending champion Kotuku Ngawati (1:00.35) and Samantha Wilkins (1:00.67).
Coutts was only a quarter of a second off the world record of 57.45 recently set by Hungarian Katinka Hossuzu.
She broke the previous best by an Australian of 58.50 set by Emily Seebohm in a 'supersuit' in 2009.
"I did a few time trials in training before worlds (world championships in Barcelona), and went 58.4 and 58.3, so I knew that I could go under the Commonwealth record," Coutts said.
"But I didn't think I could go that fast."
As she did the previous night in backing up to bag double gold, Coutts stepped up to triumph in the 50m freestyle final.
The 26-year-old powered home in 24.56 to pip Melissa Mitchell (24.64) and Holly Barrett (24.69).
London Olympian Melanie Schlanger (24.73) finished just outside the medals in her comeback from injury.