Hosts: Budapest, Hungary Dates: 23-30 July
Coverage: Live across BBC Two, BBC Red Button, Connected TV, online, BBC Sport mobile app and BBC Radio. Click for full times.
Britain's Adam Peaty defended his 50m breaststroke title with another stunning display to complete a World Aquatics Championships double-double.
Peaty, 22, who also retained his 100m title on Monday, finished in 25.99 seconds - just short of the world record 25.95 he set in the semi-final.
Brazil's Joao Gomes Junior took silver and South African Cameron van der Burgh was third.
Olympic 2008 champion Rebecca Adlington said: "No-one is even close to him."
Peaty was level with his rivals in the first few strokes but was pulling away after 30 metres. The City of Derby swimmer appeared set to break the world record for a third time in two days, but narrowly fell short.
"There not enough words to describe how good he is," former British swimmer Mark Foster told BBC Sport.
"Under 26 seconds for the second time - only four hundredths of a second off his best time. It was, again, an immense swim."
Van der Burgh, the 2009 and 2013 world champion in the 50m breaststroke, paid tribute to Peaty's powerful performances.
"I think I have to retire and give it a few years and come back when he's older," joked the 29-year-old.
"It's really impressive. It's not even breaststroke anymore, he's swimming like a new kind of stroke, like a metamorphosis between (butter)fly and breast.
Coverage: Live across BBC Two, BBC Red Button, Connected TV, online, BBC Sport mobile app and BBC Radio. Click for full times.
Britain's Adam Peaty defended his 50m breaststroke title with another stunning display to complete a World Aquatics Championships double-double.
Peaty, 22, who also retained his 100m title on Monday, finished in 25.99 seconds - just short of the world record 25.95 he set in the semi-final.
Brazil's Joao Gomes Junior took silver and South African Cameron van der Burgh was third.
Olympic 2008 champion Rebecca Adlington said: "No-one is even close to him."
Peaty was level with his rivals in the first few strokes but was pulling away after 30 metres. The City of Derby swimmer appeared set to break the world record for a third time in two days, but narrowly fell short.
"There not enough words to describe how good he is," former British swimmer Mark Foster told BBC Sport.
"Under 26 seconds for the second time - only four hundredths of a second off his best time. It was, again, an immense swim."
Van der Burgh, the 2009 and 2013 world champion in the 50m breaststroke, paid tribute to Peaty's powerful performances.
"I think I have to retire and give it a few years and come back when he's older," joked the 29-year-old.
"It's really impressive. It's not even breaststroke anymore, he's swimming like a new kind of stroke, like a metamorphosis between (butter)fly and breast.