Three-time Olympian Melissa Wu has underlined her class to win the women's platform title at the Australian diving championships in Sydney, while Rio bronze medallist Maddison Keeney has added another two national titles to her list.
And, 16-year-old Matthew Carter has upstaged more-fancied rivals to win the men's three-metre springboard to present world championships selectors with a headache.
25-year-old Wu showed she had made a full recovery from an injury earlier this year by dominating Thursday's platform final, and looked certain to compete this year in Hungary at her fifth world titles.
She finished with a total of 380.50, which included an 81.60 for her final dive, with Rio teammate Brittany O'Brien second on 325.25.
Wu is enjoying some of the best form of her long career, having won a silver medal and splitting the Chinese Olympic gold and silver medallists at last month's world series event in Canada.
Keeney celebrated her 21st birthday on Tuesday, the same day she and Olympic bronze medal partner Anabelle Smith won the three-metre springboard.
On Thursday, she added the one-metre individual and the three-metre mixed synchro with Domonic Bedggood to her Australian titles.
With the three-metre final still to come on Friday, Keeney might contest four events in Budapest.
Selectors will face a dilemma choosing the team for the men's three-metre, with outsider Carter taking the national title.
But selectors will take into account all three rounds of the competition and - with 2016 Olympian Kevin Chavez finishing top of the leaderboard after the preliminary round, and two-time Olympian James Connor taking the honours in the semi-final - it will make for a tough final decision.
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