New surname, same result.

Libby Trickett (nee Lenton) reinforced her status as the world's premier exponent in the 100m butterfly before the Beijing Olympics by swatting away Jess Schipper at the trials in Sydney.

Trickett (56.81s) continued her recent dominance over Schipper (57.31) by handing out her fellow Queenslander's biggest beating over two laps since the 2004 Athens Olympics.

The reigning world title holder's blistering swim saw her become the second woman to break the 57-second barrier and moved her within striking distance of Dutchwoman Inge De Brujin's imposing world mark of 56.61s.

Schipper had been a major stumbling block for Trickett in the past before she finally toppled the 2005 world champion at last year's Melbourne world championships.

Trickett felt with her place now secure on the Australian team for Beijing, she was ready to launch an assault on the 100m freestyle world record later in the week.

"Hopefully it bodes well, sometimes you never really can tell," she said.

"The first one at an Olympic trials is always a bit harder because you have not made the team but now that I am there and I am on it , it is like a weight lifted off my shoulders.

"It is a relief and now I can really go about swimming my heart out."

Trickett has owned the 100m freestyle world record on two occasions and this form made Britta Steffen's mark look on borrowed time.

It was another night of fast times with 15-year-old backstroker Emily Seebohm (59.78 seconds) continuing her record-breaking form - this time it was a Commonwealth mark in the 100m.

Seebohm, who broke the 50m backstroke world record on Saturday night before Sophie Edington bettered it on Sunday night, became the first Australian woman to crack the one minute barrier in the 100m and ploughed her way closer towards American Natalie Coughlin's (59.21s) world mark.

The 15-year-old became emotional after carving 0.73s off her best time.

"The job is not over yet I still have to make the team tomorrow night," she said.

"It is the first time that an Australian girl has gone under one minute and I am absolutely ecstatic about it.

"I can't believe it is me that is actually doing it.

"I did not actually think I would break it, let's just hope I can do better."

Brenton Rickard (1:00.04) swept aside the heartbreak of bombing out at the 2004 Olympic trials by reclaiming his national record in his victory in the 100m breaststroke.

He and Christian Sprenger (1:00.22) both secured trips to Beijing.

Australia's men's 4x200m stocks are also on the rise with Patrick Murphy (1:46.67) taking just under two seconds off his best time to lead qualifying for Monday's hotly-contested final.

Tarnee White (1:06.04) continued her sizzling form in the semi-finals by becoming the second fastest person in the history of the 100m breaststroke behind compatriot Leisel Jones.

Linda MacKenzie (4:04.73) then showed all of her grit to smash the 400m freestyle national record by more than a second in downing Bronte Barratt (4:05.19).

Edington followed that up by taking advantage of Seebohm's absence in the non-Olympic 50m backstroke by breaking the world record in a time of 27.67 seconds.

It was some 0.28s off the mark set by Seebohm just 24 hours before hand.

Edington said she was keen to test herself in Monday's backstroke 100m final, which is an Olympic event.

"All the girls are swimming really fast at the moment, so it's going to come down to milliseconds at the end," Edington said.

She was thrilled to bits with how fast she was able to swim in the new Speedo suit, which she wore for the first time in the meet.

"I've been saving it up and I'll be really excited to be putting it on again tomorrow night," she said.

"I'm looking forward to getting out there and seeing how fast I can actually go."

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