Libby Trickett, Christian Sprenger and Emily Seebohm set world short-course records at the Australian swim championships on Monday.
Trickett broke her own record in the 100-meter freestyle, finishing in 51.01 seconds to improve on her mark of 51.70 set three years ago.
Sprenger broke the world mark in a 25-meter pool in the 200-meter breaststroke, finishing in 2 minutes, 1.98 seconds. The previous record of 2:02.92 was set more than five years ago by American swimmer Ed Moses.
Seebohm's time of 58.54 for the 100-meter individual medley broke American Natalie Coughlin's previous mark of 58.80 set in November 2002.
"I just went in there with the right mind, and came out with a good time," Seebohm said.