Russia's Yuliya Efimova followed up Friday's world championship gold medal in the women's 200 metres breaststroke by setting a world record in the 50 metres version of the event in her heat on Saturday.
Here are other key moments and athletes to look out for at Tokyo 2020 when the sport gets underway in earnest on Saturday
Touching home in a time of 3:42.44, Sun held off a storming swim from Olympic champion Horton, who had failed to even qualify for the event at the Australian trials but was added to the squad as a discretionary pick.
At the medal ceremony, Scott shook hands with fellow bronze medallist Martin Malyutin of Russia, who finished with the same time as the Briton, but then completely cold shouldered Sun, refusing to make eye contact and not offering a handshake.
Michael Phelps gifted himself an early birthday present by winning the 200 metres butterfly at the US Olympic swim trials on Wednesday to punch his ticket to the Rio Summer Games.
American Caeleb Dressel will become a global superstar predicts Olympic historian Bill Mallon.
Caeleb Dressel won the blue riband men's 100m freestyle as the United States celebrated two gold medals in the Tokyo pool on Thursday while China's women responded with two golds, and a world record, of their own in another thrilling day of swimming.
The contest for the Laureus World Sportsman of the Year award promises to be one of the most competitive ever with the likes of Usain Bolt, Cristiano Ronaldo and Andy Murray vying for top honours.
Missy Franklin was the 17-year-old darling of American swimming in 2012, returning home from the London Olympics with four gold medals and being hailed as the sport's brightest young star.
Bronte Campbell repaid the faith in her by Australia's selectors as she chased down Canada's Taylor Ruck in the final leg of the 4x100 metres medley relay to ensure the home nation won their eighth successive Commonwealth Games title on Tuesday.
Pint-sized 13-year-old Momiji Nishiya took gold in street skateboarding -- new to the Olympics in Tokyo -- while in one of the Games's staple sports a "Terminator" hunted down a dominator to set the swimming pool alight.
Dressel had already won three individual golds and three relay titles in Budapest and Sunday's addition allowed him to match his compatriot Phelps's tally from the 2007 championships in Melbourne.
American swimmers smashed records and grabbed gold at the world championships on Friday, with sprint king Caeleb Dressel taking down Michael Phelps' 100 metres butterfly world record and teenager Regan Smith lowering the women's 200 backstroke mark.
At 19, Milak is the youngest winner of the 200 butterfly since Phelps triumphed as an 18-year-old in 2003, the second of the American great's five world titles in the event.
Regarded as the Oscar of sports, the nominations for 2018 Laureus World Sports Awards were finalised following a ballot by the world's sports media.
Summary of sports events and persons who made news on Saturday
With a jam-packed schedule brimming with both legendary athletes and captivating storylines, Paris 2024 promises unforgettable moments.
Australia set a world record of 7:41.50 en route to winning the gold medal in the women's 4x200 freestyle relay at the world championships on Thursday.
A summary of sports events and sports persons, who made news on Wednesday.
From soccer genius Lionel Messi to sprint king Usain Bolt, a shimmering array of the world's greatest sports stars are in the race for top honours at the prestigious Laureus World Sports Awards -- also called the 'Oscars of Sport' -- to be presented.
Drysdale wins close single sculls gold Also, check out late gold medal winners from Day 7...
A summary of sports events and sports persons, who made news on Frisday.
A summary of sports events and sports persons, who made news on Monday