Cameron McEvoy has broken the Australian record to win the 100m freestyle at the Rio Olympic trials in Adelaide on Monday night.

McEvoy clocked 47.04 seconds, almost a second ahead of young gun Kyle Chalmers (48.03) with James Roberts third (48.32).

World titles silver medallist McEvoy eclipsed Eamon Sullivan’s 2008 mark of 47.05.

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Dual world champion James Magnussen will be sweating on his Rio selection after finishing fourth (48.68).

Only a top-two finish within the Olympic qualifying time of 48.49sec guaranteed a Rio 100m individual berth.

Relay spots come down to head coach Jacco Verhaeren’s discretion when he confirms his team on Thursday.

Meanwhile, former world champion Cate Campbell defied a freak wrist injury to qualify fastest for the women’s 100m freestyle final in a scorching time.

Cate Campbell held off sister Bronte in the semi-finals of the women’s 100m. Photo: Getty

Nursing a wrist complaint sustained while sleeping, Campbell clocked 52.41 seconds in her semi-final – her fastest time since she claimed the 2013 world title.

The time would have won London Olympic gold and pipped her younger sister Bronte for victory at the 2015 world titles in Russia. It was just shy of her 52.33 PB.

She finished ahead of reigning world champion Bronte Campbell (52.78), who was second fastest ahead of Tuesday night’s final.

Cate Campbell believed she was almost back to her best after overcoming 2015 shoulder surgery.

“It’s the fastest since I won the world title so I am pleased but also surprised,” she said.

“But I tend to do my best swims when I surprise myself.”

Meanwhile, dual world champion Mitch Larkin (one minute, 54.68) was fastest qualifier for Tuesday night’s 200m backstroke final.

It was the world’s fastest time of the year.

Madeline Groves (2:05.47) won her fourth straight women’s 200m butterfly title to book a Rio berth along with 17-year-old runner-up Brianna Throssell.

World junior silver medallist Matthew Wilson (two minutes, 09.90 seconds) claimed 200m breaststroke gold but outside the Rio qualifying time.

-AAP