Kaylee lands stunning triple crown

Kaylee McKeown, the swimming superstar who was born and grew up in the City of Moreton Bay, has completed a golden sweep at the World Championships.

The 22-year last night added the 200m backstroke world title to the 50m and 100m crowns she has won in Japan.

It needed a typical last-length surge by McKeown, who went to school in Caboolture, to take the title in 2 minutes 3.85 seconds.

"That means a lot, I didn't think I would be able to do that," the Redcliffe-born champion said.

It followed an "insane" gold medal from Cam McEvoy and world record in the mixed 4x100m freestyle relay which equalled the Dolphins best World Championships campaign.

McEvoy's win in the 50m freestyle saw him become the nation's oldest world champion at 29 and the mixed freestyle relay team of Jack 

Cartwright, Kyle Chalmers, Shayna Jack and Mollie O'Callaghan added an exclamation mark of a world record.

Australia's 13th gold on the back of mixed relay, has guaranteed the Dolphins will finish the World Aquatics Championships as the No. 1 nation - with seven finals tonight, the last day of competition.

The last time Australia topped the tally at the worlds was 2001, also in Fukuoka. Australia has set five world records at this meet with O'Callaghan involved in four.

On Sunday night, O'Callaghan could equal Ian Thorpe's Australian record of six gold medals at a single world championships created in Fukuoka in 2001.

"I'm too busy to think about it, to be honest," O'Callaghan said.