Perth: Australia welcome China, Japan and the United States to the Aquatic Super Series from Friday with homeboy James Magnussen hoping his slim new frame will take him to a third world championship triumph in 2015.
Magnussen is looking for a fresh start in Perth after upsetting Swimming Australia at the end of last year by dumping his long-standing coach and joining Mitch and Lach Falvey in Sydney.
The reigning 100m freestyle world champion felt he needed a change to stay in contention for July`s world championships in Kazan, Russia, and the 2016 Olympic Games in Rio.
Now five kilos (11 lb) lighter and refreshed from a new strength and conditioning schedule, Magnussen says he has already seen results.
"I felt it was time that I took a little more control over my career and went out and set up a new team around myself," Magnussen said.
"It`s been really exciting and it`s something fresh and new, and something that I`m looking forward to testing on the world stage."
He has recovered from a back problem and added: "I feel very physically different this time this year compared to last year.
"A lot of that comes with maturity and shedding a little bit of baby fat as you get older."
Cate Campbell on the other hand says she is well below 100 percent for Perth after shoulder surgery in September ended a stunning 2014 when she was Australia`s swimmer of the year.
"I will do absolutely 100 percent of what I`m capable," the world 100m freestyle champion said.
"But if I`m not quite at where I was last year or the year before that`s all right because Rio`s only 18 months away and we really need to get ourselves right for that," the 22-year-old said.
The United States, led by 11-time Olympic medallist Ryan Lochte, will be looking to halt Australia`s domination of the two-day outdoor event in its third year on Australia`s west coast.
Australian coach Jacco Verhaeren said the competiton would be tough with the whole team in heavy training.
"We`re racing the strongest nations in the world," he said.
"They won`t give anything for free so the competition is very good."