Steve Cram
BBC athletics commentator on BBC TV

Kariem Hussein in lane two takes the win but everybody else did not perform. Jack Green will be out.

Image source, Reuters

Colombia’sOlympic championCaterine Ibarguen has taken a very early lead with 14.67m in the triple jump.

That was another messy race. The best hurdlers in the world have made it look very difficult tonight, with Mamadou Hann hitting the final hurdle hard and it cost him.

Jack Green is fourth in his semi-final as TJ Holmes wins it in 49.12.

Laura Muir is out on the warm-up track. Can she do it tonight? The field is stacked with world-class athletes but her PB of 3:55.22 is right up there.

Also in the final of course is Britain's Laura Weightman.

Still plenty of athletics to come tonight - Men's 400m hurdles semi, women's triple jump final, women's 400m semi, men's 110m hurdles and women's 1500m...

Gold for Anita Włodarczyk. Is she sport’s most dominant performer right now?

Image source, .

Image source, Getty Images

Britain have twice won silver in this event - Hannah England (2011) and Lisa Dobriskey (2009) - but Laura Muir will hope to be their first world champion. The Scot's main rivals look to be Rio champion Faith Kipyegon and current champion Genzebe Dibaba, while 800m Olympic champion Caster Semenya will also be a threat and British team-mate Laura Weightman will hope to snatch a medal.

Image source, Getty Images

The triple jump is just about to start.

The top three at last year’s Olympics have the top nine jumps in the world this year. Venezuela’s Yulimar Rojas has five of those.

Colombia’sOlympic champion Caterine Ibarguen heads that list. The two-time reigning world champion went on a 34-event winning streak between 2012 & 2016. Kazakhstan’s Olga Rypakova won world bronze in 2015 and at the Rio Olympics. She was the best qualifier with a leap of 14.57m.

Sophie Hitchon speaks to BBC Two after placing seventh in the hammer: "I couldn't quite find the rhythm I had in qualification. I knew I was in shape and am just disappointed not to produce it tonight. The crowd was great, I'm just disappointed I couldn't pull it out of the bag for them.

"It just didn't click for me today. It's sport, everyone else did better than me today."

Irish hurdler Thomas Barr - a sub 48-second man at his best - is not at his best unfortunately. He's another one who is ill and misses out altogether. Top two go through automatically. Tough now.

Olympic champion Kerron Clement of the US is in trouble as they reach the home straight, maybe fifth place, but he comes back like a train to win it in 48.35.

Norwegian Karsten Warholm does the opposite, leading all the way before tying up but he's second and through.

Deb: Feel for Sophie and also Holly so much goes into these big events - think they'll both come back fighting . Hugs

Ali Jawad: I can't take @SophieHitchon, external crying...it's making me emotional and I never cry

Denise Lewis
Olympic heptathlon gold medallist on BBC TV

"It was a strange competition. All the girls are down on their performances. You can see how bitterly disappointed Sophie Hitchon is. It breaks your heart. She knows when you come into a competition so well, healthy and then don't deliver, it's so hard to take.

"She seemed relaxed. Sometimes you just can't put your finger on it. I don't know what happened between the warm up and now. It just happens. The mistakes hurt, they really hurt."

Sophie Hitchon, who won bronze in Rio remember, would have needed a PB to get amongst the medals tonight. But she is in floods of tears as the athletes leave the track. Inconsolable. But she's stopping for the BBC cameras...

Image source, Reuters

As messy a run as you will ever see, but Shamier Little made it through...

Image source, Getty Images

More hurdling next up on track. Men this time.

Jack Green goes in the second semi-final for Britain and will have to run close to his best to reach the final, with only the first two in each semi guaranteed a place.

Green has run 48.77 this season, with American TJ Holmes in lane six arguably the favourite for his semi.

Great Britain captain Eilidh Doyle, who qualified for the 400m semi-finals, talking to BBC Sport: "You have to run your own race when you're on the outside. I eased off coming into hurdle 10.

"I've enjoyed being captain. It's been a real honour. It will be so tough tomorrow. I can run a PB and not make the final."

Image source, Team Personal Best

As Gabby Logan mentioned, if Luvo Manyonga's story (19:56) has inspired you, find out how you can use sport - whether athletics or otherwise - to help you in many aspects of your life on the Get Inspired index.

And there are lots of Team Personal Best events taking place during the next month in conjunction with the championships.

Meghan Beesley goes out very hard, she's maybe second after 150m or so.

She's put herself in a good position but ties up off the final bend and is run out of it.

Lea Sprunger wins it in 55.14, Beesley is sixth in 56.41 - that may be enough...