Lani Pallister of Australia has stunned Katie Ledecky with her first international 800-meter freestyle loss at the Pan Pacific Championships.

Summer McIntosh led all the way in winning the 400-meter individual medley at the Pan Pacific Championships.

Katie Ledecky won the 1,500-meter freestyle at the Pan Pacific Championships, earning her first international medal on home soil.

Olympic champion Ariarne Titmus has announced her immediate retirement from elite swimming in a surprise move.

The United States, which had a frustrating swim world championships, ended on a high note Sunday with a world record in the women’s 4x100 medley in the last event of the eight-day championships.

The United States set the world record in the 4x100 freestyle mixed relay, clocking 3 minutes, 18.48 seconds in the swim world championships.

The gold medals were spread around Friday at the swimming world championships, thanks to the absence of stars Léon Marchand of France and Canadian Summer McIntosh from any finals on Day 6 in Singapore.

Katie Ledecky has ceded a tiny bit of ground in other events, but she’s still unbeatable in the 1,500-meter freestyle.

The United States team at the swimming world championships in Singapore is battling a case of “acute gastroenteritis” that compromised performances on the opening day of eight days of competition in the pool.

For Summer McIntosh of Canada, it’s one gold medal won at the swimming world championships with four to go.

Léon Marchand’s life changed drastically after he won four gold medals a year ago in the Paris Olympics.

Summer McIntosh is set to compete in five individual events at the world swimming championships in Singapore.

Yu Zidi of China is only 12 years old and has qualified for the world swimming championships in Singapore.

Tommy Tuberville is a U.S. senator running for Alabama governor.

Katie Ledecky has capped another stellar Olympics by becoming only the second swimmer to win the same event at four straight Summer Games, holding off Ariarne Titmus to win the 800-meter freestyle.

Another romp for Summer McIntosh.

Katie Ledecky has tied one of swimming’s most impressive records.

Turns out, those comparisons to Michael Phelps weren’t farfetched at all when it comes to Léon Marchand.

The atmosphere for Olympic swimming is electrifying.

Another Chinese doping allegation has flared up at the Paris Games, angering some swimmers who say officials need to enforce drug-testing rules consistently.

Katie Ledecky got started on what she hopes will be her first gold medal of the Paris Olympics, fastest in the heats of the 1,500-meter freestyle.

Swimming’s next generation of stars claimed the spotlight at the Paris Olympics on Monday night, a brash group that comes from all over the globe.

Simone Biles leads the United States women into the gymnastics team final as part of an action-packed slate Tuesday at the 2024 Paris Olympics.

The Australian women are about the surest thing in swimming, and they showed it Saturday on the first night in the Paris Olympic pool.

It was billed as one of the most anticipated races of the Paris Olympics.

The 2024 Paris Olympics are underway.

The opening ceremony for the 2024 Paris Olympics is over, and the competition is really going to rev up on Saturday all across France.

The cauldron is lit, and the action is picking up at the Paris Olympics.

The crowds were large and raucous.

Caeleb Dressel has locked up his second individual race in Paris, giving him another chance to shine after his stellar performance at the last Olympics.

As always, it looks like a strong U.S. swim team that will head to the Olympics.

Coming back from long layoffs, American swimming stars Caeleb Dressel and Simone Manuel had to settle for relay spots at the Olympics on Wednesday night.

Katie Ledecky is heading to her fourth Olympics, cruising to victory in the 400-meter freestyle at the U.S. swimming trials.

Katie Ledecky is off to a rousing start at the U.S. Olympic swimming trials.

Olympic champion Katie Ledecky says faith in the anti-doping system is at an “all-time low” in the wake of the way global regulators handled a case involving Chinese swimmers.

Learn all about Katie Ledecky ahead of the 2024 Paris Olympic Games.

In an exclusive interview with NBC Olympics, Katie Ledecky dives deep on her mindset heading toward the Paris Olympics, her relocation to Florida following the Tokyo Games, competing against swimmers who idolized her growing up, and looking ahead to the Los Angeles 2028 Games.

Find out which records and milestones are in danger of being 'eclipsed' at the 2024 Paris Olympics by stars like Katie Ledecky, Simone Biles and Diana Taurasi.

Few swimmers have made a splash as big as Katie Ledecky, the Olympic gold medalist and two-time winner of The Associated Press Female Athlete of the Year award.

A summary of the top storylines in the sport of swimming that have taken place since the Tokyo Olympics, focusing on the biggest personalities looking ahead to the 2024 Paris Olympics.

This will definitely be a unique "French touch" for medal winners this summer.

With some of America’s biggest stars deciding to stay home, Claire Curzan and Hunter Armstrong have claimed the spotlight at the World Aquatics Championships in Doha, Qatar.

Katie Ledecky’s 13-year unbeaten streak in the 800-meter freestyle is over.

Anthony Nesty has made more history with his selection to lead the U.S. men’s swimming team at the Paris Olympics.

American swimmer Katie Ledecky's legacy keeps growing.

Katie Ledecky has won the women’s 1,500-meter freestyle with ease at the swimming world championships on a day that saw fellow American Ryan Murphy triumph in the men’s 100 backstroke.

American freestyler Katie Ledecky has almost never gone home with anything other than a gold or silver medal in the Olympics or world championships dating from the 2012 London Games.

Chase Kalisz has become the seventh American swimmer to make six world championship teams.

In a sport still struggling to diversify, Anthony Nesty is a significant presence on the pool deck at the U.S. national championships.

Katie Ledecky will concede that a few things have changed over her long career at the top of swimming.

Katie Ledecky has joined an elite club, earning her sixth trip to the world championships with a dominating victory in the 800-meter freestyle at the U.S. nationals.

Olympic star Caeleb Dressel has returned to the competition pool after a layoff of nearly a year.

A change of scenery worked out just fine for Katie Ledecky.

Detained WNBA star Brittney Griner was front and center at The ESPYS.

Katie Ledecky has extended her record haul of medals from the world swimming championships to 22 with her latest 800-meter freestyle win.

Italy’s Thomas Ceccon has set a world record in the men’s 100 backstroke and Katie Ledecky has claimed yet another gold at the swimming world championships in Budapest.

Katie Ledecky has started the United States’ medal collection at the world swimming championships with a gold by reclaiming her title in the women’s 400 meters.

President Joe Biden praised Team USA for bringing a bit of unity to a pandemic weary nation as he hosted a White House celebration Wednesday with about 600 athletes from this year’s Winter Olympics in Beijing and the coronavirus-delayed Summer Games held in 2021 in Tokyo.

Athletes to watch at the 2024 Paris Olympics

Svetlana Romashina wins seventh gold with Russian Olympic Committee in artistic swimming team final.

Katie Ledecky gave all the details on what Team USA swimmers have been eating in Tokyo, how she managed to stay on top of an unpredictable bus schedule and the feeling of swimming next to Katie Grimes.

In The Village podcast host Elizabeth Beisel asks her former teammate Katie Ledecky to take us off the pool deck and into the dining room at the Athlete’s Village to learn what fuels her athletic achievements.

As the swimming events at the Tokyo Olympics conclude with fewer medals and a lot fewer golds for the United States, what comes next?

American star Caeleb Dressel still has a shot at five gold medals.

Caeleb Dressel set a world record and Katie Ledecky won her third straight 800m freestyle gold Saturday at the Tokyo Olympics.

Katie Ledecky made more history for the U.S. in the pool.

While they cannot be in person at the Tokyo Aquatics Centre, supporters of Team USA swimmers send their love from afar.

The willingness of athletes, led by Simone Biles, to talk about the pressures they face as elite athletes on the Olympics stage, has forced a look at how NBC presents the Games to the public.

"You never take anything for granted," said Ledecky after expressing intent to compete in 2024. "You never know if you're going to be at the next Olympics."

Caeleb Dressel has won his third gold medal of the Tokyo Olympics with a world record in the 100-meter butterfly.

Katie Ledecky won the women's 800-meter freestyle on Saturday in Tokyo, her final event of the Olympic Games

Get primed for swimming on Day 8 of the Tokyo Olympics with the top storylines to follow from each event.

Get primed for swimming on Day 8 of the Tokyo Olympics with the top storylines to follow from each event.

Tatjana Schoenmaker knocked off the first individual world record in swimming at the Tokyo Olympics.

Caeleb Dressel is expected to be the star of Day 7 at the Tokyo Games as he seeks his third gold medal in Friday night coverage of the Olympics.

Katie Ledecky and 15-year-old teammate Katie Grimes went 1-2 in their 800m freestyle heat, setting up a potential podium moment in the final.

China wins the 4x200m freestyle relay, but Katie Ledecky shines as the U.S. takes silver. All three medalists broke the world record.

Caeleb Dressel got his first individual gold medal, the Chinese women put together a record-setting relay and American Sunisa Lee won the women’s all-around gymnastics gold.

Zhang Yufei had a much busier morning than she was expecting at the Tokyo Aquatics Centre.

Caeleb Dressel lived up to the hype in an Olympics where many of the U.S. favorites have faltered.

The U.S. women's swimming team is pocketing plenty of medals at the Olympic pool.

Katie Ledecky will be the first to concede that her standards are almost impossible to meet, especially at this stage of her stellar swimming career.

The Australian swimmer known as the Terminator who took down Katie Ledecky at the Olympics has done it again.

Katie Ledecky got her first gold medal of these Olympics, while Simone Biles pulled out of another event she came into the Games favored to win.

Day 5 Olympics roundup: After another defeat, Katie Ledecky bounced back to reassert her dominance, while Dutch athletes excelled in several sports.

After a fifth-place finish in her first race of the night, Katie Ledecky didn't have much time to recalibrate. After adding a gold to her collection, Ledecky battled emotion to explain exactly how she did it.

Finally, a gold medal in Tokyo for Katie Ledecky.

Katie Ledecky picked up a long-awaited gold medal in the first women's 1500m freestyle final in Olympic history.

Catch up on the action from the Tokyo Aquatics Center on Day 5 of swimming at the Olympics.

Ariarne Titmus won the women's 200m freestyle at the Tokyo Olympic Games.

Day 5 of the Tokyo Games features another busy day at the Aquatics Centre with five swimming finals and the men’s diving synchronized springboard final.

Get primed for swimming on Day 4 of the Tokyo Olympics with the top storylines to follow from each event.

Alaska, of all places, has an Olympic champion at the pool.

Catch up on the action from the Tokyo Aquatics Center on Day 4 of swimming at the Olympics.

It's official. The two fastest women in the pool, Katie Ledecky and Ariarne Titmus, will square off again in the 200 meter freestyle final.

Three of Team USA’s brightest swimming stars chase gold medals on the fourth day of competition from the Tokyo Aquatics Center

Simone Biles and Team USA seek their third consecutive gold medal in women's gymnastics in Tuesday's team final.

Katie Ledecky shined as the women's 1500m freestyle made its Olympic debut during Monday's prelims.

Races often end in a blur for Canada’s Maggie MacNeil because she wears glasses outside the pool but doesn’t use contacts or prescription goggles when swimming.

Australia’s Ariarne Titmus ran down Katie Ledecky in the 400-meter freestyle, handing Ledecky her first-ever Olympic silver in an individual event.