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  1. South Africa's Van Niekerk wins 400m in 43.48 seconds
  2. Gatlin (19.87) & Bolt (19.96) win their 200m semis
  3. GB's Zharnel Hughes wins his semi in 20.14
  4. Eilidh Child sixth in 400m hurdles final
  5. Dina Asher-Smith fastest qualifier in 200m heats

Live Reporting

By Aimee Lewis

All times stated are UK

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Blimey. What a fantastic end to an entertaining day of track and field. Usain Bolt and Justin Gatlin have ensured there'll be another headline-making showdown on Thursday in the 200m. Three men dipped under 44 seconds in the same 400m race for the first time in history, the exhausted victor carried away on a stretcher, while Kenya have their first javelin world champion. 

We will be back tomorrow to guide you through another day. But until then why not check out CBBC's latest quiz, titled 'Could Rutherford jump...' or read our day-by-day coverage guide - or our medal table and results page... I could go on...Bye for now. 

Questions for Michael Johnson?

We're coming to the end of our coverage but before we go it's worth mentioning that Michael Johnson will be on BBC Radio 5 live on Thursday evening, between 20:10 and 21:00 BST. 

If you've got any questions for the 400m world record holder, Thursday night could be the night for answers.

Getting ready for day six...

My World Champs gets underway tomorrow. 1500m qualifying. First heat. (3.30am GMT). #Beijiing2015

My World Champs gets underway tomorrow. 1500m qualifying. First heat. (3.30am GMT). #Beijiing2015

Niekerk update

Phil Jones

BBC Sport athletics reporter

"Van Niekerk was going to go off in an ambulance but the ambulance has gone and he has stayed and is still receiving medical treatment in the stadium. I am not sure what the attention is he is receiving but it is more encouraging news."

Van Niekerk still receiving treatment

The latest on Wayde Van Niekerk is that the South African is a-ok, though he is still receiving medical treatment. 

Congratulations Wayde Van Niekerk (@WaydeDreamer), IAAF World Champion 2015 in the Men's 400m!

Congratulations Wayde Van Niekerk (@WaydeDreamer), IAAF World Champion 2015 in the Men's 400m!

'There won't be another YouTube athlete'

Very few athletes have done what I have done. There will not be another YouTube athlete coming through. I want to go back and watch my throw, it was almost perfect.

Kenya's Julius Yego, javelin gold medallist
Julius Yego
Getty Images

'To throw like this is unbelievable'

Was Wayde Van Niekerk's 400m gold the performance of the day or did Julius Yego steal the show by winning Kenya's first gold in the field? 

It was unbelievable, I am happy I won a gold medal for Kenya. I have been training hard for this championships. After Birmingham I had a serious injury and thought I would not be competing so to throw big like this is unbelievable.

Kenya's Julius Yego, javelin gold medallist

'Van Niekerk gave everything'

Michael Johnson

400m world record holder on BBC TV

Van Niekerk was taken out of his comfort zone. Merritt stretched him, but he gave everything he had, he was able to hold form and get to the finish line. 

Go hard, and go home on a stretcher

What do you have to do to become a world champion? Push yourself when the legs are screaming no, go quicker than you've ever run before, take your body to places its never been. 

You won't have the energy for a victory lap, mind, and stepping on that podium the next day is going to paaaain-ful. 

Wayde van Niekerk
Getty Images

Great race, great performance by the S.African. Absolutely gave it his all, incredible stuff #VanNiekerk #bbcathletics

'We are warriors'

l ran a personal best, I ran well but not good enough for the gold. I can't complain, I got a silver and go home with some hardware. The 400m is never easy. We are warriors and rise to the occasion.

LaShawn Merritt, men's 400m silver medalist
LaShawn Merritt

National record not enough for a medal

Domanica's Luguelin Santos broke a national record, clocking 44.11, but that was only good enough for fourth.

It was a special race - James

It was a special occasion, a once-in-a-lifetime race and I am glad to be part of a special group of 400m runners in this era.

Kirani James, who won bronze in the men's 400m final
Kirani James
Getty Images

'I will come back stronger'

There were a lot of fireworks in the final. I tried to come out and put in a decent performance but it was just beyond my reach. I will take that, go home and come back and cause some problems. It is quite an achievement for me to come here and make the final and run 44 seconds back to back, but I will come back stronger.

Britain's Rabah Yousif, who came sixth in men's 400m final
Rabah Yousif

Setting a new standard

He ran so fast that he needed a stretcher to get off the track. 43 second is the new standard for medalist in the 400m.

A historic 400m race

Whoosh - Van Niekerk wins 400m gold in 43.48 secs, Merritt silver in 43.65, James bronze in 43.78 - first time in history three men under 44

Stretcher for Van Niekerk

Britain's Rabah Yousif was sixth in 44.68. 

An incredibly quick race and Wayde van Niekerk's legs have given away. There'll be no lap of honour for the South African as the medical team come to take him away on a stretcher. Exhausted and elated in equal measure. 

Van Niekerk

'So much pain for Van Niekerk'

Darren Campbell

Former British sprinter on BBC Radio 5 live

Van Niekerk can't celebrate, he's holding on to the barrier for support, and he's down again. He's in so much pain. He's not thinking about a lap of honour. That's how hard it was.

'What a run by Van Niekerk'

Allison Curbishley

BBC athletics expert on Radio 5 live

That's how you run a 400m! He screamed out of the blocks and put so much air between Kirani James and himself that he gave James no chance of thinking he could close the gap. That was painful, he will be crying lactic, he can't even stand up.

Wayde Van Niekerk

'Stunning win for Van Niekerk'

Steve Cram

BBC athletics commentator

A stunning performance from Van Niekerk. Who could have predicted he would run a 43.48 seconds, that puts him fourth on the world all-time list. Merritt and James could not catch him, a brilliant win and a brilliant time to beat a brilliant field.

Van Niekerk wins 400m gold

LaShawn Merritt explodes out of the blocks like a firecracker. Can anyone chase him down? Yep. South Africa's  Wayde van Niekerk gets him at the bend and is home and dry in 43.48. 

That puts the South African fourth in the all-time list. Merritt takes silver in a personal best 43.65, while Olympic champion Kirani James ends up with a bronze in a season's best 43.78.

Men's 400m final

Michael Johnson

400m world record holder on BBC TV

This is the highest quality field of 400m runners I have seen in a long time. Six of the eight athletes in the field have under 44 seconds, we haven't see that in the 400m for quite some time.

Men's 400m final

Olympic champ Kirani James was beaten by LaShawn Merrit in the 2013 World Championships final, of course, and the American is in contention again, in Beijing to defend his title.

Britain's Rabah Yousif Bkheit, who set a personal best in the semi-final, crosses his fingers as he's announced.

"I'm going to declare war now. I'm going to chase after a medal," he said after progressing to the final. 

Kirani James
Getty Images

Men's 400m final

That hour is now upon us. The curtain will close on day five of the World Championships when the 400m final concludes. 

The one-lap kings set quick times in the heats, not so quick in the semi-finals, so how fast will they go today? 

It's very much seen as a battle between Olympic champion Kirani James and South Africa's Wayde van Niekerk. 

'There's energy left in the tank'

I am a bit tired and need some rest, but I am feeling OK. I tried to preserve some energy for the final. The 200m is my best event and I believe I will do well."

Usain Bolt after winning his 200m semi-final
Getty Images

200m lane draw - Bolt in six, Gatlin in four

The draw for Thursday's 200m final has been revealed and Britain's Zharnel Hughes has drawn the short straw. He's in lane five, which doesn't sound so bad, but he's got Justin Gatlin inside him in lane four and training partner Usain Bolt outside him in lane six.

Jepkemoi digs deep for steeplechase gold

Allison Curbishley

BBC athletics expert on Radio 5 live

That looked like it was going to be a German victory but what a run from the Kenyan athlete. She didn't take the water jump the prettiest but she wanted the gold the most.

Andrew Cotter

BBC Sport commentator

Kenya are collecting gold after gold, what a championship they are having.

Jepkemoi is world steeplechase champion

Hyvin Kiyeng
Getty Images

What a finish. There were three in contention... swaying, running like they've been on the hard liquor such punishment their legs have taken. 

But it was Kenya's Hyvin Jepkemoi who had the speed to pull clear of the rest, winning in 9:19.11.

Tunisia's Habiba Ghribi had to make do with second, while Germany's Gesa Felicitas Krause was third. 

Gold for Silva

Yarisley Silva of Cuba is your new pole vault world champion! Incredible performance as she clears 4.90m. Congrats!

Yarisley Silva of Cuba is your new pole vault world champion! Incredible performance as she clears 4.90m. Congrats!

Silva wins pole vault gold

The pole jump final is reaching a conclusion and, on her final attempt, Cuba's Yarisley Silva clears 4.90m! Bravo. Her team are cock-a-hoop and who can blame them. Their lady has one hand on the gold medal. 

Yarisley Silva
Getty Images

Women's 3,000m steeplechase

The next gold medal will be awarded to the best female 3,000m steeplechaser in the world. Kenya's Virginia Nyambura, victorious in three Diamond League races this year, is one of the favourites. 

The others to keep an eye on are Tunisia's Habiba Ghribi and Ethiopian duo Hiwot Ayalew and Sofia Assefa. 

Seventh for Bradshaw

Holly Bradshaw fails all three attempts at 4.80, which means the Briton has no chance of winning a medal in the pole vault. 

She did vault a season's best 4.70m, though, and can say she's the seventh best pole vaulter in the world

Holly Bradshaw
Getty Images

Bolt in 'cruise mode'

Colin Jackson

Two-time world 110m hurdles champion on BBC TV

Usain Bolt

Bolt was just in cruise mode and did enough to come off the bend in first place. He has so much spare. He is maybe looking to do something special in that final.

Can Gatlin beat Bolt in the 200m?

Darren Campbell

Former British sprinter on BBC Radio 5 live

"Gatlin will have to jump all over Bolt around the bend. The lane draw will be so important in the final. Can Gatlin put Bolt under pressure? This is getting more and more exciting.

Bolt wins 200m semi in 19.96

Usain Bolt closes in on Danny Talbot coming into the bend and it's easy for the six-time Olympic champion, who wins in a season's best 19.96. 

Talbot was sixth, producing a personal best 20.27. 

The two other automatic qualifiers were South Africa's Anaso Jobodwana (20.01)  and Turkey's Ramil Guliyev (20.10).

Usain Bolt
Getty Images

'Worrying for the rest'

Michael Johnson

400m world record holder on BBC TV

19.87 secs is worrying for everyone in the 200m, that is faster than most athletes in the field and Gatlin cruised to it.