Australia have ended the opening night of the swimming world championships with a dose of double golden joy after the country's men and women prevailed in the 4x100m freestyle relay events.
There was heartbreak to begin the night after Australian Sam Short was pipped by 0.02 of a second by German world record holder Lukas Maertens in a thrilling 400m men's freestyle showdown in Singapore.
But the relay events proved to be Australia's saviour, propelling them to the top of the standings.