It came on a second day of pool swimming finals at the Duna Arena.

Peaty, the reigning Olympic and world 100 metres breaststroke champion, accelerated clear of his rivals in the opening 50m and was on course to challenge his own world record of 57.13 seconds until the closing stages.

He ultimately touched in 57.47, a Championship record and the second fastest time in history.

The 22-year-old now holds the top 10 fastest 100m times in history.

"I went out there with a lot of guts tonight," he said afterwards.

"If you want to go 56 you’re going to have to do stuff you’ve never done before and I was out in a 26.5 - that was very, very easy. 

"I'm still 1.5 seconds ahead of the rest of the world, I’m very happy with that."

American Kevin Cordes took a distant second place in 58.79 as Russia's Kirill Prigoda managed 59.05 for bronze.

Proud then continued Britain's good night by claiming 50 metres butterfly honours in 22.75.

It followed his fourth placed finish in his favoured 50m freestyle at Rio 2016.

Brazilian veteran Nicholas Santos took silver in 22.79 while Ukraine's Andrii Govorov took bronze in 22.84. 

There was no doubt what the crowd enjoyed most today, however, as Hosszú backed her billing as the biggest current star of world swimming.

She triumphed in 2:07.00 to emulate her 2013 and 2015 successes.

Yui Ohashi took Japanese silver in 2:07.91 while Madisyn Cox took a distant American bronze in 2:09.71.

Sweden's Sarah Sjöström was the day's other winner after a Championship record success in the women's 100m butterfly.

It marked her fourth successive title as she clocked 55.53 to narrowly miss her own world record by five hundredths of a second.

Australia's Emma McKeon took silver in 56.18 while American Kelsi Worrell earned bronze in 56.37.