Catch-up: Women's 20km walk under way & day three highlights
Dina Asher-Smith wins silver in women's 100m final - Shelly-Ann Fraser-Pryce takes gold in 10.71
New British record for Asher-Smith of 10.83
Eighth Worlds gold for Jamaica's Fraser-Pryce; Marie-Josee Ta Lou gets bronze
GB's Holly Bradshaw fourth in women's pole vault final
USA win gold in mixed 4x400m relay, GB fourth
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Women's 100m final
The key names...
Dina Asher-Smith: Triple European champion is bidding for a first individual global medal (she has won relay silver & bronze from 2017 & 2013 respectively).
Shelly-Ann Fraser-Pryce: Two-time Olympic 100m champion (2008 & 2012). The quickest woman in Doha through the heats and semi-finals.
Marie-Josee Ta Lou: At London 2017 World Championships she won silver over 100m and 200m.
Women's 100m final
Michael Johnson
Four-time Olympic gold medallist athlete on BBC TV in Doha
The semi-final showed that Dina is in control, sh'es running very solid races, and she's been doing that throughout these championships.
She was in command in her semi-final. That will boost her confidence. She opened the gap more and more, and that was a world-class heat. She's in some of the best shape of her life.
Here we go then. Dina Asher-Smith is down on the track...
Women's 100m final
The IAAF website is reporting that Dafne Schippers of the Netherlands is out of the 100m final after picking up an injury in the warm-up.
Schippers won bronze in the 100m in London two years ago but she's a two-time world champion in the 200m, and those heats are tomorrow...
Image source, ReutersMixed 4 x 400m relay final
Here's how things went down when Poland opted to mix up their order and leave a female athlete defending a last-leg lead....
If you are just joining us, America won the first World Championship gold in the mixed 4x400m relay. Such are the times, they were handed a selfie stick by the looks of things. Either that or it's a rather pointless fishing rod.
Anyway, the next entry will give you the chance to watch how things went down...
Image source, Reuters
Image source, .Men's triple jump final
The two-time Olympic champion Christian Taylor watches on as his American compatriot Will Claye has one last chance to better the leading mark of 17.92m.
It's big from Claye. He gets a good board, he moves close to the winning mark but 17.66m will not get the job done.
Taylor is the golden man... again. World champion in 2011, 2015, 2017 and 2019.
Hand that man a golden bucket and spade.
Saj Chowdhury
BBC Sport in Doha
Don't they know there's a 100m final coming up?
Image source, BBC Sport#bbcathletics
Gareth Hancock: Dina Asher-Smith looking in TOP form. Confident she'll bag a medal tonight.
Lydia Wellgress: Dina Asher Smith bosses her semi-final and from the coverage it looks like the first thing she did was check the injured English Gardner is OK. What a woman
Lee Fergusson: Really good run from that Marie-Josée Ta Lou.
Sunday feels.
Walking into the office on a Monday morning like...
Image source, Getty ImagesWomen's 100m final (21:20 BST)
A reminder we are 23 minutes away from this show down between Dina Asher-Smith and Shelly-Ann Fraser-Pryce for World Championship gold over 100m.
Someone go and tell Jamaica it's on.
Image source, .Men's triple jump final
Elsewhere...
American Christian Taylor, who fouled in the first two rounds and was on the brink of exiting the competition, has overhauled fellow American Christian Taylor by jumping 17.86m in the fourth round and then 17.92m in the fifth.
Claye's best is 17.74m. Both men have one attempt left.
Image source, EPAWomen's pole vault final
She's done it!
With Sandi Morris just mising on her final attempt at 4.95m, Anzhelika Sidorova knows that if she clears it, she'll be taking home the gold medal.
And she does just that with a superb final run. A lifetime best and, more importantly, a gold medal.
America's Morris takes silver, with Katerina Stefanidi taking the bronze. Great Britain's Holly Bradshaw is fourth after a fine effort.
Mixed 4 x 400m relay final
Here's a shot which shows the gap Michael Cherry opened up for the US on that final leg.
Allyson Felix, who was on leg two, now has 12 World Championship gold medals, one clear of the great Usain Bolt.
Felix, 33, gave birth in November and is back out there winning titles. Quite remarkable.
Image source, .
Steve Cram
BBC Sport athletics commentator in Doha
There was a little fumble on the handover on final leg by Great Britain. It didn't affect them too much.
Hats off to Poland - well done for having a go and doing something different that nearly, almost, paid off.
Andrew Cotter
BBC Sport commentator in Doha
The Polish plan just didn't quite work.
Mixed 4 x 400m relay final
Michael Cherry of the US absolutely fizzes past the female Polish leader. Martyn Rooney is hunting a medal in fifth and is making ground but he will not make an impact.
Cherry has pulled around 40 metres clear of the field and Poland's last-leg female athlete is getting hauled in by Jamaican and Bahrain athletes.
Javon Francis gets Jamaica home in second, Bahrain are third and Rooney has Britain home fourth. Poland fifth. Their strategic move didn't come off.
Rafat Omelko opens a healthy gap on the women around him on leg two and hands over, Poland have around 30 metres. I think they've judged this quite well. Emily Diamond is in fourth for Great Britain as she gets ready to hand over to Martyn Rooney. Remember Rooney will be chasing down a woman...
This is full on....
Rabah Yousif in lane three for Great Britain, it's all men on this opening leg.
Yousif struggling to make an impression as he hands to Zoey Clarke on leg two. She starts purposefully. It's a man racing against seven women here as Rafat Omelko has the baton for the Polish four...