Michael Johnson
Four-time Olympic gold medallist athlete on BBC TV in Doha

Dina established herself from the very beginning. She would have wanted to run this like a final, which she did. She's only two-hundredths of a second off her personal best.

She really put a foot down and established herself. The only thing now is what colour will that medal be?

Image source, .

A great start from Dina Asher-Smith as she flashes out of the blocks, drives and already has a gap opened up. No one will catch her and it's a season's best 10.87.

A contrast as down the track, the American with a brilliant name - English Gardner - is face down on the track clutching her hamstring.

Asher-Smith home first, Jonielle Smith of Jamaica through in second.

Here we go. Semi-final pressure...

Image source, Getty Images

No British woman had ever run under 11 seconds – she has done it in every race in 2019 bar the British Championship heats (six times in total).

It is 36 years since Britain had a women’s World Championships sprint medallist – Kathy Cook’s 200m bronze in Helsinki.

Hands on hips, Dina Asher-Smith glares down the track.

Colin Jackson
Two-time world 110m hurdles champion on BBC TV in Doha

Dina needs to keep focused at this moment. There's probably more tension in the semi-final than the final because in the final, you've made it.

To Dina Asher-Smith in semi-final number two. The big medal hope...

BBC Sport

Great Britain's Daryll Neita, speaking to BBC Sport: "I'm going to have to wait and see. I haven't really had enough time to process it yet. I came here wanting to get into the final, I had no other vision to be in that final. Fingers crossed..."

Neita will need to qualify as a fastest loser if no athlete outside of the first two places can better 11.18 in the next two semi-finals.

Holly Bradshaw is about to have a second bash at 4.80m...

...and this time, she clears it! She lets out a "whoop!" and she's up into third. Still plenty of pole vaulters to go, though.

Marie-Josee Ta Lou is too good in the women's 100m semi-final. She dominates and takes it out from Elaine Thompson, clocking 10.87 to Thompson's 11.00.

Great Britain's Daryll Neita in fourth is done for on 11.18. Only the top two make it through and there will be two fastest losers from the three semi-finals.

Here we go then. Great Britain has Daryll Neita in lane six.

Look out for Ta Lou in five - great hair and very dangerous. Remember it's semi-final and final tonight....

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Right, shall we have some women's 100m semi-finals?

Elaine Thompson is among the field in the first heat, as is Britain's Daryll Neita.

Saj Chowdhury
BBC Sport in Doha

Also at the IAAF exhibition was a to-scale board showing the heights of the pole vault world records.

The women's is held by retired Russian Yelena Isinbayeva, who is actually in Doha at moment.

It stands at 5.06m. It's unlikely that will threatened inside the Khalifa.

I was going to stand next to it and have a photo taken, but sadly I was alone.

Image source, BBC Sport

And now Anzhelika Sidorova makes 4.80m look like a piece of cake.

That's two clear...

Sandi Morris is the first athlete to clear 4.80m!

She lets out a huge roar and a "come on" as she sails over the bar with ease. The American is up into first place.

Of the seven athletes to attempt 4.80m so far, no-one has cleared it.

Holly Bradshaw's outdoor personal best, incidentally, is 4.81m...

Michael Johnson
Four-time Olympic gold medallist athlete on BBC TV

I think Shelly-Ann Fraser-Price sent a message yesterday - "I want to challenge myself as the undisputed favourite for the gold medal."

Denise Lewis
Olympic heptathlon gold medallist on BBC TV

Dina is on the cusp of greatness. She's about to enter uncharted territory. She can deliver because as far as I'm concerned, Dina has never let us down. She's always hit the money, always been on point. Now we're thinking this girl can really win a medal.

Saj Chowdhury
BBC Sport in Doha

While on the hunt for a coffee - perhaps not wise after 7.30pm - I bumped into (left to right) Isla, Phil, Ayse,and Ella who have all come fully prepared to cheer on Dina Asher-Smith to her first world outdoor medal.

Father Phil said: "We're originally from Cambridge and we've been living in Doha for six months. We're just settling in, but what a great tine to come here.

"We're all hoping Dina wins."

Image source, BBC Sport

It's pole vault and women's 100m semi-finals for us now. Dina Asher-Smith in action no less. The main man Saj Chowdhury has been out finding some of her fans.

Saj... where are you...