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".
Michael Phelps has, for the first time, declared his intention to compete at the 2016 Olympics in Rio de JaneiroRead the full story ›
The new report released by the Amateur Swimming Association shows that 20% of men and 22% of women aged over 14 in England cannot swim.Read the full story ›
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.
Our selection of Friday's best photographs from the wide world of sport.
Olympic swimming champion Michael Phelps has said he is "deeply sorry" after he was charged for driving under the influence and two other offences.
The US swimmer was clocked driving a white 2014 Land Rover at almost twice the speed limit and crossing lanes illegally in a tunnel in Baltimore, Maryland.
He later took to Twitter to apologise for his actions:
(1/3) Earlier this morning, I was arrested and charged with DUI, excessive speeding and crossing double lane lines.
(2/3) I understand the severity of my actions and take full responsibility.
(3/3) I know these words may not mean much right now but I am deeply sorry to everyone I have let down.
Phelps is the most successful Olympic athlete of all time, amassing a total of 22 medals as well as several world records.
Japan has expelled one of its top swimmers from the Asian Games after he was caught stealing a camera.
Naoya Tomita, 25, the 200-metre breaststroke gold medallist from the 2010 games, could face criminal charges over the theft of the camera, owned by a South Korean media organisation, team bosses said.
Surveillance cameras at the games in Incheon, South Korea, captured Tomita putting the camera in his bag after watching his team-mates compete.
Officials said he admitted taking the camera.
One in five parents have banned their child from swimming in the sea because they worry about their safety, a poll has found.
The study by Amatuer Swimming Association found less than a third of parents say they are completely happy to let their children swim in the sea.
One in five wont let their children into the waves at all because they feel its too dangerous.
Nearly a third of parents say that they will only let their children swim in the sea if they go with them.
Michael Phelps, the most decorated athlete in Olympic history, is coming out of retirement amid speculation he will aim to compete at the 2016 Rio Games.
USA Swimming said the 29-year-old will compete for the first time since London 2012 later this month at a meet in Mesa, Arizona.
Phelps, who has 22 Olympic medals including 18 gold, returned to training last autumn and has completed the six-month waiting period to be eligible for competition by the US Anti-Doping Agency.
Rebecca Adlington found fame in the Beijing Olympics where she won two gold medals, and at last year's London 2012 Games she took home two bronze medals.
At the beginning of the year she announced her retirement from the sport to pursue a career in broadcasting.