Alicia Coutts won the 100-metres freestyle to claim her third national title at the Australian championships on Wednesday.
Coutts became the sixth Australian woman to break the 54-second barrier as she posted a personal best time of 53.80secs to beat Yolane Kukla (54.59) and Bronte Barratt (54.67).
Five-time Delhi Commonwealth Games gold medallist Coutts believes she can go even faster at July's world championships in Shanghai.
She also welcomed the return of former Olympic champion Libby Trickett, who is aiming to claim a relay berth in Shanghai in a time trial in June and an individual berth at next year's London Olympics.
"Obviously my freestyle time is nowhere near as good as her times before she retired," Coutts said of Trickett, who swam 52.62 in a super suit at the 2009 world championships in Rome.
"Certainly if she can get back to where she was I'd like to have her to chase, it'll definitely be good."
Coutts also won the 100m butterfly and 200m individual medley titles.
Trickett will have to beat a field likely to include Emily Seebohm, Alice Mills and Marieke Guehrer in a one-off race in Adelaide on June 29 and go faster than 54.99, the fifth-fastest time in Wednesday night's final, to secure a relay spot on the worlds team.
Breaststroke ace Brenton Rickard also claimed his third title of the meet, taking the 200m in 2:11.84 from Craig Calder (2:13.12).
Sally Foster (2:24.65) claimed the women's 200m breaststroke but her time fell outside the qualifying time to make the worlds team.
Ashley Delaney (1:58.50) also missed out in winning the 200m backstroke.
