Mooney entered the event with a personal best of 51.34 seconds, but qualified fastest for the final with a time of 50.74 seconds.

He slashed that further in the 17 years boys final (50.39) to edge out Jack Goyen in an ideal build-up to next month's Australian Open Championships, also in Adelaide.

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Mooney won last year's 16 years 100m title in 51.42 seconds, and has long touted his desire to smash the 50-second barrier as soon as possible.

His coach, Gennadiy Labara, said it was a strong effort after their preparations were slightly disrupted by COVID about two months ago.

"It was a good result, we planned for this," he said.

"We've put a daily, weekly, monthly plan together in the lead-up,.

"Jamie had COVID a couple of months ago, and is now coming back to form.

"He has a chance to post some good times in the other events, and hopefully test the Queenslanders."

He finished 55^th overall in last year's Australian Open Championships, but his winning time on Wednesday night would have been enough to finish ninth in the final.

Mooney has a jam packed schedule of seven events at the Age Championships, and he will back up for the Open Championships also in Adelaide next month.

He posted a big personal best in Thursday's 100m butterfly heats to make Thursday night's final.

Fellow Wagga swimmer Chloe Donelan finished 12^th in the 15 years girls 200m backstroke on Wednesday night, with Isaac Mooney 14^th in 16 years boys 200m freestyle.

Wagga Paralympian Ashley Van Rijswijk took home gold in the 50m breaststroke at the Australian Para Championships, while Harry Keane won silver in 12-14 years 100m multiclass butterfly, and bronze in 50m backstroke, and 50m butterfly.

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