Olympic Channel were on site in Korea as Kristof Milak smashed Michael Phelps' 200m butterfly world record.
Wednesday 24 July marked at the midpoint of the swimming events at the FINA World Championships in Gwangju, South Korea, and also one year to Tokyo 2020.
Olympic Channel were on the ground as Kristof Milak, the Buenos Aires 2018 Youth Olympic Games champion, smashed Michael Phelps' 10-year-old world record in the event.
Re-live all of Wednesday's action with our blog below (newest updates first). Come back for daily live blogs throughout the Championships.
Alternatively, you can catch up with what happened on Tuesday 23 July here.
12 - 28 Jul 2019
FINA World Championships - Gwangju
All times below are Korean Standard Time (UTC+9 hours).
One year to Tokyo 2020, and didn't Kristof Milak make a name for himself today!
The 2018 Youth Olympic Games triple champion smashed Michael Phelps' 10-year-old world record in the 200m butterfly to put himself firmly among the favourites next year.
We leave you with the day's best photos – as well as our Olympic Channel #1YearToGo special.
Adam Peaty, who also won gold tonight in the 50m breaststroke, has been discussing Great Britain's bronze in the mixed medley relay.
"We're very dominant in Europe, but obviously when it comes to the world stage we've got some extreme talent to go against," he said. "We've put a great job together tonight. It's one of those events where you don't really know how to pace it, but we'll have to learn for Olympics."
Georgia Davies, who swam the opening backstroke leg, explained her thinking racing against men: "You have to see it as you're swimming in your own lane and it's kind of like a time trial. You just know that if we all individually do good splits, then we should have a good overall time.
"It's my fourth World Champs and it's my first medal. At the age of 28 I finally got there, with the help of these guys!"
Mitch Larkin, who swam the opening backstroke for Australia in that mixed 4×100m medley relay, paid tribute to his teammates in the mixed zone after.
Larkin had almost no time to recover from his 200m individual medley semi-final before going again in the relay final. "I sort of tired out, quite heavily, in my legs at about 45 metres, which is a long way to go," he admitted.
"But Matt and Emma had a fantastic split and Cate finishes it off perfectly every time. It's a fantastic team and we'll see what happens next year."
Matt Wilson, the breaststroker, won his first world title with the Australian victory, and said he enjoyed the race.
"It's so much fun to swim, you don't know where you kinda are in the race because everyone's got different legs, you've got the guys racing the girls.
"That's my first gold medal at Worlds and I'm going to remember this one for life. I'm forever grateful for the job my teammates have done here."
Emma McKeon withdrew from a race yesterday through illness – which has kept Katie Ledecky sidelines – but returned tonight with a 51.04-second butterfly, racing against USA's Caeleb Dressel.
"Obviously I haven't had a great start to the week with my health," she said. "Just to get into a relay is a good way to get back in the pool.
"On the turn I knew the boys would be coming at me so I just shut my eyes because I didn't want to see where they were, and then just swam as hard as I could.
"I'm feeling a lot better today."
The Aussies were anchored by Cate Campbell. "I knew it was going to be a really tight race tonight and I knew I had to stick to my race plan and back myself to get the job done. Ultimately, I'm really pleased with my performance and the performance of the team."
Italy's Federica Pellegrini was in tears after winning the 200m free final.
Speaking after the race, she said: "I'm super happy because this is my last world championship.
"These are not tears of sadness, they are tears of joy.
"I've worked a lot over these years, I love working hard and I'm glad I can see the results."
You can read our report on that here.
The bronze medallist in the 200m fly final, Chad le Clos, is pretty effusive in his tribute to Kristof Milak for that world record swim.
"Lost for words, really, that was a great swim from Kristof, as I told you it would be yesterday!
"Unbelievable race, probably one of the greatest races ever to break that world record.
"I thought I was going to be the one to do it, but congratulations to him. I tried my best, I went for it and tried to hang on.
"Nothing changes. I could've come eighth tonight and I'll still come to Tokyo to try to win it. Kristof is a hell of a lot faster than all of us, he's in another league at the moment, but I'm hunting him down. It's easy now that I've got the target now where I need to be."
The new 800m world champ, Gregorio Paltrinieri, has been in Gwangju longer than most of his rivals – he finished sixth in the 10km open water swim last week to qualify for Tokyo 2020 in that event.
"It was difficult to change from the open water to the swimming pool," admitted the Italian. "So it's crazy to be here right now top of the podium. I was silver in Kazan (2015), bronze in Budapest (2017); I just missed the gold. It's crazy.
"Open water was a new situation for me, after Rio I just wanted to try something new. I started very quietly, but this was my first international competition in open water.
"I'm feeling good right now, and we'll see in the 1500m."
Under the world record split after 100m, with Evgeny Rylov leading off for Russia. 51.97, and that's a new European record in the 100m back.
The Russians have led off with two men, and they're six seconds under the WR split at 200m.
Here come the other teams with strong legs. It's USA who lead after 300m, Caeleb Dressel clawing back a lot of time.
Outside the WR split now but this is a tight finish. Simone Manuel leading the US home, but can she hang on?
Australia - anchored by Cate Campbell - have caught up! And they've overtaken the Americans! Australia win gold, it won't be a perfect eight-for-eight for Dressel!
USA silver, Great Britain bronze.
That event makes its Olympic debut in Tokyo and based on that will be a great watch.
A game of tactics here for the teams: who swims which leg of this mixed 4×100m medley relay?
We'll start off with backstroke, of course.
Adam Peaty goes for Great Britain; Caeleb Dressel for the USA.
Worth pointing out quickly that Milak's mark also makes him the first man under 1:51 in the 200 fly.
Anyway, we've had the men's 200 IM semis in the meantime, and your eight finalists are: Jeremy Desplanches, Philip Heintz, Daiya Seto, Chas Kalisz, Mitch Larkin, Duncan Scott, Abraham Devine, and Wang Shun.
We've also had the semi-finals in the women's 200 fly while we recovered from the men's final.
Here are the eight who have made it through to tomorrow's final: Hali Flickinger, Katie Drabot, Boglarka Kapas, Liliana Szilagyi, Franziska Hentke, Alys Thomas, Svetlana Chimrova, and Laura Stephens.
Two finalists each for the USA, Hungary, and Great Britain.
Here's what the man himself – who also won this event at October's Youth Olympic Games – has to say.
"It's a tremendous honour to beat such a great man's world record.
"When I turned back and I saw the time, 1:50.73? All the pressure and tension just went off my back and all the joy came out."
Incredibly, Michael Phelps had held the men's 200m fly world record since 2001.
You can read our report on Milak's achievement here.
Peaty is the world record holder in this event as well, in 25.95.
They're off. This will be a quick race. And a tight one, by the looks of it.
Here comes the WR line... just misses the world record! 26.06 for the Brit, who wins his second gold of this meet.
It's silver and bronze for Brazil.
Adam Peaty, the only man under 58 (and 57) seconds in the 100m, is about to go in the 50m breaststroke final.
He's got another final later tonight when he races in the 4×100m mixed medley relay.
Time for the Men's 200m Butterfly final.
London 2012 champ Chad le Clos told us yesterday he expect Kristof Milak to win this...
Le Clos out to a fast start! He leads his Hungarian rival through the first 50, and through 100 too - under the World Record split!
Here they come for the last 100. Milak now leads, and still under the world record split at 150...
Is Michael Phelps' world record about to go? YES!
New world record for Kristof Milak! 1:50.73. That breaks a 10-year-old record! That had stood at 1:51.51.
Daiya Seto wins silver; Le Clos takes bronze.
So, after a slight delay in that second Women's 50m Backstroke semi-final, we have confirmation of our eight finalists tomorrow.
They are: Kathleen Baker, Etiene Medeiros, Georgia Davies, Kaylee McKeown, Olivia Smoliga, Caroline Pilhatsch, Kira Toussaint, and Daria Vaskina, who were all separated by just 0.17 seconds!
He was 0.1 second behind at the turn, but that's comfortably for USA's Caeleb Dressel, who is going for eight gold medals here this week.
It's the Russian Grinev who leads at halfway but here comes Chalmers, and he's going to beat the Russian to the wall!
A quick break from the medal action now as we have the first of the semi-finals in the men's 100m freestyle.
Kyle Chalmers of Australia goes in lane two.
Titmus is ahead at 150 but it's so close down the back straight! Four of them together!
Pellegrini in front now, it's very close...
Gold to Italy! Titmus claims silver and bronze to Sjostrom!
The winning time was 1:54.22.
Sarah Sjostrom, Federica Pellegrini, Olympic 100m champ Penny Oleksiak, and world 400m champ Ariarne Titmus all go in this women's 200m free final.
At 600m, Paltrinieri is well clear. He's got nearly four seconds on his closest challenger.
It's still anyone's for silver and bronze. We've got the bell for the final 100m.
It'll be gold to Italy. Norway's Christiansen has pulled away in second now. Here comes the Norwegian!
He's making a late push but it's gold to Paltrinieri! 7:39.27, a new European record. Christiansen silver, Aubry of France wins bronze.
It's Gregorio Paltrinieri who leads at halfway. Detti has faded.
Paltrinieri has about a body length on the Australian, McLoughlin.
Sun goes in Lane 8. The world record in this event is 7:32.12.
Detti is into an early lead after 50m, under the WR split. A long way to go though.
The two Italians lead through 100m, 150m, and 200m.
Five finals tonight in swimming, and we're ready to go with the night's first: the men's 800m freestyle.
China's Sun Yang and Italy's Gregorio Paltrinieri and Gabriele Detti are the ones to watch.
This event makes its Olympic debut at Tokyo 2020.
16-10 the final score in the second semi-final.
Congratulations to Spain, who reach the championship match against USA and also seal a spot at Tokyo 2020.
The result of that first semi-final effectively means the winner of this second semi-final, between Spain and Hungary, will qualify for Tokyo 2020.
We're just underway in the second period and Spain have a 5-3 lead.
Just half a minute left in this match, and it isn't particularly close.
Team USA's unbeaten run will continue as they lead 7-2.
Both China's Sun Yang and Great Britain's Duncan Scott have been warned by FINA after the pair clashed during and after the medal ceremony last night for the men's 200m freestyle.
A FINA statement, issued at the end of yesterday's action, reads:
The FINA Executive met today in Gwangju (KOR) to analyse the situation occurred during the men’s 200m free victory ceremony and has decided to send a warning letter to athletes Duncan Scott (GBR) and Sun Yang (CHN).
Both competitors had an inadequate behaviour on this occasion, which is not acceptable in accordance with the FINA Constitution Rule C 12.1.3.
Scott refused to shake Sun's hand, which led to the Chinese athlete reacting angrily and screaming at him.
We're go, go, go in the women's water polo semi-finals!
Team USA, unbeaten in 51 matches, take on Australia for a spot in the final.
The top team from this World Championships will qualify for Tokyo 2020 (if the USA wins the title, the spot will go to the runner-up team.)
Those with vertigo: Look away now!
Great Britain's Gary Hunt won the Men's high diving gold medal with this effort. High divers can reach speeds of 85 km/h on the way down.
Australia’s Brianna Throssell has declined her spot in the Women’s 200m Butterfly semi-finals due to scheduling.
The Australian was seeded tenth with a time of 2:07.39.
Rio 2016 silver medallist Mitch Larkin meets some really big fans of his in Korea outside the Nambu University Aquatics Centre.
The Australian's fans will get another glimpse of him in tomorrow's Men's 200m Individual Medley final.
Men's 27m high diving favourite Gary Hunt wins gold!
Two years after letting a World Championship medal slip through his hands by fluffing the final dive in Budapest, the Brit was all smiles atop the podium in Gwangju.
He recorded a score of 442.20 to seal his second world title after Kazan in 2015.
She is the 200m Freestyle world champion, world record holder and an Olympic gold medallist from Beijing 2008.
The 30 year old Italian star is in another 200m Free final this evening, but how does she stay motivated?
We visited her to find out, and you can watch the interview here.
The United States place a huge importance on the relay races, and they have set the fastest time in the 4x100m Medley Relay heats.
The team of Matt Grevers, Andrew Wilson, Kelsi Dahlia and Mallory Comerford had too much for Australia, who finished second in the heat and second overall.
The final will be tonight's last race, so expect fireworks!
Hali Flickinger has comfortably won the women's 200m Butterfly heats in a time of 2:05:96 and will be the favourite to do so again in this evening's semi-final.
Hungarians Boglarka Kapas and Liliana Szilagyi finished second and third overall respectively.
With one year to go until Tokyo 2020, Daiya Seto has just qualified for the Men's 200m Individual Medley semi-finals with a powerful heat.
He finished second overall to Hungarian Laszlo Cseh, who recorded figures of 1:57:79.
American Chase Kalisz won the final heat and finished third overall.
Following Katie Ledecky's withdrawal from yesterday's 200m Free heat and 1500m Free final, it has emerged the five-time gold medallist is still unfit to swim.
A USA Swimming spokesperson said:
“Katie woke up this morning not feeling any better. Medical staff continue to work with her and to monitor her. She is resting and has not yet had the opportunity to get back in the water.”
She is due to take part on the 4×200m Free Relay on Thursday, followed by the 800 Free heats on Friday morning.
It might have been a tough World Champs for Team USA so far, but the Caeleb Dressel show just keeps on running.
The American claimed top spot in qualifying for the Men's 100m Freestyle in 47.32 seconds. That's fourth fastest time on the American records list... but he has the top three as well!
Shinri Shioura and Katsumi Nakamura gave Japanese fans in the stadium something to cheer about, both progress to this evening's semi-final.
It's a fast start to the morning by China's Yuanhui Fu, who records the fastest Women's 50m Backstroke heat in 27.70 seconds.
Great Britain's Georgia Davies and Olivia Smoliga of USA also win their heats to qualify for this evening's semi-finals.
At Rio 2016 Sarah Sjostrom became the first Swedish woman to win an Olympic gold medal in swimming.
We caught up with the 25-year-old in Gwangju, to discuss her excitement for defending that title in a city that she loves, Tokyo.
09:30 - 18:30 Water polo: Women's semi-finals
10:00 - 13:00 Swimming preliminary rounds
Women's 50m Backstroke
Men's 100m Freestyle
Men's 200m Individual Medley
Women's 200m Butterfly
Mixed 4x100m Medley Relay
12:00-13:30 High diving: Men Rounds 3 & 4
20:00 - 22:40 Swimming
Men's 800m Freestyle final - Sun Yang (CHN) is going for a fourth 800m Free title.
Women's 200m Freestyle final - Federica Pellegrini (ITA) could become the third woman to win a specific swimming event at least four times at the world champs.
Men's 100m Freestyle semi-final
Women's 50m Backstroke semi-final
Men's 200m Butterfly final - Kristóf Milák (HUN) can become the first teenager to win this world title since Phelps in 2003.
Men's 50m Breaststroke final - Adam Peaty (GBR) can become the first swimmer to win six breaststroke world titles.
Womnen's 200m Butterfly semi-final
Men's 200m IM semi-final
Mixed 4x100m Medley Relay final
Hello and welcome back to the Olympic Channel FINA World Championships daily blog.
Today is a special day for more than one reason. Not only will be six medals won this evening in swimming and high diving, but today also marks EXACTLY ONE YEAR TO UNTIL THE TOKYO 2020 OLYMPICS.
As if the swimmers, water polo players and divers needed any more incentives to perform in Gwangju, this is their last major opportunity to score a psychological victory over their rivals before the big show in Japan.
With the likes of Adam Peaty, Sarah Sjostrom, Chad le Clos, Federica Pellegrini in the hunt for world titles today, it's going to be fast, fun and furious in the water.