Adam Peaty has broken his own world record in the men's 100 metre breaststroke at the World Championships in Gwangju, South Korea.
Peaty, 24, smashed the previous record of 57.10 seconds he set at last year's European Championships to win in 56.88.
In doing so, the Britain achieved one of his career goals of becoming the first man to break the 57-second barrier in the event.
Peaty finished close to two seconds ahead of China's Yan Zibei, who finished the first semi-final in second place in 58.67, with fellow Briton James Wilby third in 58.83.
Uttoxeter-born Peaty swam the first 50 metres in 26.63 and the second in 30.25, both quicker than his previous world record splits of 26.75 and 30.35.
He has now swum the event 1.4 seconds faster than anyone else in history and has set the best 16 times ever recorded in the 100m breaststroke.
Peaty said: "It feels incredible! I've been chasing that for three years now ever since I touched the wall in Rio I knew I could go faster.
"I said this morning I wasn't going to chase 56, I was going to let it come to me, and that's exactly what we've done."
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A ten-year old girl from Bahrain caused a splash after becoming the youngest swimmer ever to compete at a World Championship.
Alzain Tareq, daughter of former professional swimmer Tareq Salem, raced in the women's 50m butterfly heats in Kazan.
Tareq, who stands at just 4ft 2in, finished last but is already the fastest swimmer in her country.
"I'm happy, I feel so happy. It was really cool," she told reporters after competing against adults almost three times her age.
The Bahrain schoolgirl now has a clear goal just one year from Rio de Janeiro 2016: "I want to swim at the Olympics".
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Despite being the country's most popular sport, swimming in England has seen a huge fall in participation numbers over the last year with 245,000 fewer people taking part.
Funding body Sport England says it is 'disappointed and concerned' at swimming's eight per cent drop which has significantly affected overall participation numbers in sport.
There's also been a drop off in participation across all sports. In the year ending October 2014, 125,100 fewer people did some kind of sport once a week for 30 minutes - bringing the overall number down from 15.7million to 15.6million.
Sports minister Helen Grant, said: "I am very concerned by the overall dip in participation over the last 12 months. Sports governing bodies have long argued that they can bring new people to their sport and funding should go via them but some are simply not delivering and it's not good enough."
Swimming remains the country's most popular sport with over 2.6million people taking part weekly despite the drop, which is certain to lead to a funding cut.