O’Callaghan’s hat-trick of gold, as mixed relay smash world record

• Mollie O'Callaghan leads mixed relay team to WR time in 4x100m
• Kaylee McKeown takes gold in 200m backstroke at world championships

Mollie O'Callaghan has made it a hat-trick of golds while leading the mixed 4x100m relay quartet to Australia's first global landmark at this year's world swimming championships.

And Kaylee McKeown has underlined her standing as one of Australia's marquee swimmers with her first world championship triumph in the 200m backstroke in Budapest on a milestone penultimate day for the Dolphins.