South Africa's Van Niekerk wins 400m in 43.48 seconds
Gatlin (19.87) & Bolt (19.96) win their 200m semis
GB's Zharnel Hughes wins his semi in 20.14
Eilidh Child sixth in 400m hurdles final
Dina Asher-Smith fastest qualifier in 200m heats
A celebratory jig from Julius Yego as he learns he has become world champion, the first Kenyan to win a world title in a field event.
The Commonwealth Champion's 92.72m winning throw ruined everyone else's hopes. Only two men have thrown further than that.
Egypt's Ihab Abdelrahman El Sayed (88.99) wins silver, with Finland's Tero Pitkamaki (87.64) taking bronze.
The favourite and defending champion Zuzana Hejnova is clear of everyone after negotiating the final barrier which means there's only going to be one winner.
The Czech wins in a world leading 53.50. Brit Eilidh Child was sixth.
Image source, Reuters400m hurdles final (13:10 BST)
Perri Shakes-Drayton
British 400m runner on BBC TV
Quote MessageIt was one of the slowest qualifying times to make it, but this is a new day. When you're in the final then it's an opportunity. There are barriers in front of these athletes - you never know what might happen.
400m hurdles final (13:10 BST)
Holly Bradshaw clears a season's best 4.70m at her first attempt and the Briton gives out a cat-like yelp.
But what can Eilidh Child go in the women's 400m hurdles final? The Scot preparing herself on the start line, swaying from side to side.
Thankfully, America's Shamier Little has decided to compete wearing a radioactive green ribbon in her hair.
Image source, Getty Images
Denise Lewis
Olympic heptathlon gold medallist on BBC TV
Quote Message"It is staggering what her potential is and where she can go from here. She still has a lot of power and strength to build on.
We're into the final round in the javelin and, unsurprisingly, Julius Yego skipped the fourth and fifth rounds after his record-setting 92.72m effort in the third round.
The Kenyan looks set for gold, with Egypt's Ihab Abdelrahman El Sayed his closest challenger with a season's best 88.99m.
Image source, apQuote Message"I'm really, really happy. I didn’t expect to run a PB in the heat. I did feel relaxed which is why I was quite surprised with the time. The three who won gold have inspired us. I just have to see how the next round goes.
Dina Asher-Smith, British 200m qualifier talking to BBC Sport
Michael Johnson
400m world record holder on BBC TV
I was very impressed with the start and she looked comfortable on the bend. She was really, really relaxed running the personal best. She looks like she's been doing this for 10 years, but she's only 19. Let's see what she does over the next few years.
Darren Campbell
Former British sprinter on BBC Radio 5 live
Quote Message"Dina Asher-Smith is the real deal. This track is electric and for her to run that time from lane two shows her class. She looked so comfortable.
Image source, Reuters
Steve Cram
BBC athletics commentator
What a bend that was brilliant bend. A PB in qualifying.
Dina Asher-Smith overtakes Ivet Lalova-Collio on her inside in just a few strides and, from lane one, comes out of the bend in first place and doesn't relinquish the lead.
A personal best 22.22 for the Briton, who eases off in the final few meters.
Jamaica's Sherone Simpson (22.52) was second, with Lalova-Collio (22.54) third.
Britain's fastest teenager, the fastest woman in British history, is getting ready to race in the last 200m heat of the day.
History student, and history-maker, Asher-Smith broke the 100m British record earlier this summer and became the first British woman to dip under 11 seconds in the distance at the London Anniversary Games. What can she do on the biggest stages of all?
Image source, Getty ImagesNews filtering through that Veronica Campbell-Brown is through to the semi-finals because, according to the rule book, the Jamaican did not impede another athlete or gain an advantage from straying into the wrong lane.
"What's the point of having lanes, then?" asks a colleague.
Dafne Schippers, world 100m silver medalist, goes in the penultimate 200m head and the Dutchwoman has time to ease off the throttle, glance around to see where her rivals are, and saunter to victory in 22.58.
Image source, Getty ImagesQuote Message"I picked up a few niggles in holding camp and I wanted to make sure my muscles stayed together. I feel fine now and hopefully tomorrow I won't need these.
Margaret Adeoye tells Radio 5 live why she is running in leggins
Quote MessageShe helped me get to the finish line so I'm not complaining. That's not happened to me before. I felt a bit rusty but I wanted to make sure I got through.
Margaret Adeoye, British 200m qualifier
Darren Campbell
Former British sprinter on BBC Radio 5 live
Quote Message"It was almost like Campbell-Brown had too much speed around the bend and lost her way. She made no attempt to go back to her lane and I'm sure she will get disqualified, even though she was five metres ahead of Adeoye."