World Swimming Championships as it happened: Ariarne Titmus wins gold, breaks world record; Kaylee McKeown disqualified from semi-finals

That’s all from me tonight, but reporter Tom Decent in Fukuoka will have more for you tomorrow!

Thanks for tuning into our live coverage of the world swimming championships, what a night it has been for Australia.

Four gold medals for the Aussies in five events, and two world records!

Here’s a quick look at some of the medals up for grabs tomorrow night:

• 9:02pm - Men’s 100m breaststroke final
• 9:09pm - Women’s 100m butterfly final
• 9:46pm - Men’s 50m butterfly final
• 10:23pm - Women’s 200m individual medley final

Thanks, and have a good night!

Australia celebrate victory in the men’s 4x100m freestyle relay.Credit: Getty

Australia’s 4x100m freestyle relay team with their gold medals.Credit: Reuters

Australia’s men’s 4x100m freestyle relay gold medallists.Credit: Getty

Australia have shocked the United States with a gold medal-winning swim in the 4x100m freestyle relay.

The early stages of the race were dominated by Italy, China and the United States, but when youngster Kai Taylor entered the pool for Australia, he made up two positions to put the team in position for a podium.

Kyle Chalmers celebrate after the Australian men’s relay team claim gold.Credit: Getty

Kyle Chalmers had the final leg of the race for the Australians, and the Olympic gold medallist out-swam the USA.

At the 50-metre turn, Chalmers was still back in silver, but a charge in the final 25 metres put the Australians in the lead in the final seconds of the race.

USA are the favourites, but Australia could spring a surprise.

With Kyle Chalmers anchoring Australia, anything could happen. They just need to be close with 100m to go.

Kai Taylor, son of Australia swimming legend Hayley Lewis, could win his first international medal.

By gut feeling is a silver for Australia, given Great Britain got disqualified earlier today for a changeover problem.

The Australian women’s 4x100m freestyle relay team have smashed the world record to take home gold and absolutely obliterate the rest of the field.

It was a textbook start from Mollie O’Callaghan who put the Australian’s in the top spot after a 100-metre swim that already had the team ahead of the world record time.

When Olympic gold medallist Emma McKeon entered the water for the final 100 metres, the team were ahead by three body lengths - a lead she kept till she touched the wall in world record time.

Australia celebrate after winning gold in the women’s 4x100m freestyle relay.Credit: Reuters

Australia’s to lose.

Shayna Jack, as lead-off swimmer, pulled out a 52.28s this morning in the heats, which was the quickest time in the world this year for a 100m freestyle.

She won’t even swim the individual event here because Mollie O’Callaghan and Emma McKeon were quicker at trials.

Shayna Jack’s swim during trials is a good sign for the Australian women’s relay team.Credit: Getty

Australia are looking to make it a trifecta of world champs wins. They’ve never broken the world record in this event at a world champs.

Can they do it? I reckon it’ll just be out of reach, but gold to Australia.

France’s Leon Marchand has broken Michael Phelps’ last remaining world record to win gold in the men’s 400m Individual Medley.

Marchand was dominant across all strokes, but come the final 200 metres the frenchman surged ahead of the pack to win by four seconds and beat the swimming’s oldest record.

Leon Marchand celebrates after beating the world record.Credit: Reuters

Phelps, who was commentating on the sideline, could be celebrating Marchand’s achievement.

Australian Brandon Smith had a difficult start to the race, falling back to seventh after the butterfly section.

Smith pulled a podium finish back within range at the start of the breaststroke, but come the final 100 metres, the Australian was out-paced.