Grace Loh has overcome defending champion Rachel Goh to win the national 100m backstroke title at the short course championships in Perth on Thursday.
Loh touched the wall in a time of 57.52 to qualify for the Australian team for December's World Short Course Championships in Turkey, with Goh's time of 57.92 also within the qualifying mark.
Kenneth To has will also head to Turkey after charging to victory in the men's 100m butterfly.
The 20-year-old finished more than a second clear of silver medallist Grant Irvine (51.63), who narrowly touched out New South Welshman Joseph Carty (51.69) for second place.
Bobby Hurley has claimed his third national 100m backstroke short course title in a time of 50.98 to also qualify for the World Short Course Championships.
Ashley Delaney (51.27), the Australian record holder over the distance, was forced to settle for silver with Ben Edmonds (52.30) taking the bronze.
In other events Olympic silver medallist Christian Sprenger has clinched the Australian title in the men's 100m breaststroke in a time of 58.70.
While outside the World Short Course qualifying time, the win gives Sprenger his second title over the distance, backing up his 2010 crown.
Jeremy Meyer (59.64) claimed silver while Queenslander Nikolas Pregelj (59.83) took take bronze.
World Championship silver medallist Sarah Katsoulis won the 50m breaststroke short course crown in a time of 30.68.
Katsoulis took the gold ahead of Lorna Tonks (30.90) with Commonwealth Games silver medallist Samantha Marshall (31.15) taking bronze.
New South Wales' Travis Mahoney (4:09.07) turned in a dominant display to win the men's 400m IM ahead of Jared Gilliand (4:13.76) and David Morgan (4:15.81).
Laura Crockart won the 800m final, claiming the 32-lap race in a time of 8:31.93.
Fourteen-year-old Alanna Bowles (8:30.57) finished second with Kareena Lee third (8:30.57).
Paralympian Madeline Scott claimed her second gold in as many nights, taking out the 50m butterfly multi-class event.
Scott, who won Wednesday night's 50m breaststroke, touched in a time of 32.30, ahead of Helen Hasoloff (34.98) and Teneale Houghton (32.66).
Following his gold medal winning swim in Wednesday night's 50m breaststroke, Paralympian Jeremy Tidy (26.94) had to settle for silver behind Patrick Donachie (28.80) in the final of the men's 50m butterfly multi-class event while Teneale Houghton (2:34.29) won gold in the women's 200m IM multi-class event.
Reigning title holder Marieke Guehrer qualified fastest for Friday night's final of the women's 100m freestyle while Australian record holder Matthew Abood booked pole position for the men's 50m freestyle final.
London Olympic gold medallist Brittany Elmslie was the fastest qualifier for Friday night's women's 50m butterfly final.