Michael Johnson
BBC Sport athletics expert & 400m world record holder

"Rabah Yousif ran a very good race. It got really competitive around the curve but he held his own. It was 44.54 and it's a great race, a huge personal best and you can't do much better than that."

Isaac Makwala wins in 44.11 and has enough energy for a few celebratory push-ups.Yousef Ahmed Masrahi  (44.40) was second. 

Britain's Rabah Yousif clocks a personal best 44.54 and he can do no more than that. It might be enough to progress as a fastest loser. 

Image source, AP

On the track, Britain's Rabah Yousif Bkheit is preparing to race in the second of the men's 400m semi-finals. Saudi Arabia's Yousef Ahmed Masrahi, who topped the time sheets in the heats, and Botswana's world leader Isaac Makwala are the men who will probably stand in his way of a place in the final. 

In the men's pole vault we have first sight of Renaud Lavillenie. The bar is up to 5.80m and the Frenchman clears it as if the height is merely a few centimeters above the ground. He kisses his clenched fist. Why not? 

The world record holder and two others - Pawel Wojciechowski and Piotr Lisek - are the only men who have so far cleared that height

Allison Curbishley
BBC athletics expert on Radio 5 live

"I love these rounds - you are trying to say to your rivals 'this is so easy'. Kirani James is hardly breathing. It will be hard but he's making it look so easy. 

"This is a fast track - can they get close to Michael Johnson's world record? They will just be thinking of winning but there could be fireworks in the final."

Steve Cram
BBC athletics commentator

"From the top of the home straight Kirani James was looking around and he was sending out a message. He was not going to let Luguelin Santos go past him."

The first two automatically through to the final and they are Kirani James and Luguelin Santos (44.26). 

James was out of the blocks quickly and by the time they come out of the final bend he is in the lead. The Granadian has time to look over his shoulders, slow down slightly and cross the line first in 44.17, with Santos breaking the Dominican Republic's national record.  

Olympic champion Kirani James features in the first head and should easily as his season's best of 43.95 secos is head and shoulders above the rest. The 22-year-old James and his fellow semi-finalists being made to wait by the pole vaulters.

Isah Samson:, external I am expecting the Nigerian queen of the field to shock you all. Watch out for Blessing Okagbare. It's her time.

Michael Bennett-Lee:, external Wow wow wow wow Dafne Schippers national record and looking so relaxed. So easy so impressive.

Bola Akinola:, external Blessing Okagbare so far has 10.82 which is second best into the final and nobody is rating her.

BBC Sport's Ade Adedoyin on Twitter.

That must be a big garden.

Chris Roberts:, external Pole vault. Love Renaud Lavillenie. But Raphael Holzdeppe might challenge. Is it just me?

Rhosyn Morgan-Davies:, external Pole Vault is one of those sports that I just can't work out how it evolved, I mean it's just weird.

We've neglected the men's pole vault, which features world record holder and Olympic champion Renaud Lavillenie. He's yet to win a world title, though, so could this be his year? The Frenchman has yet to jump, content to leave the others do their thing. Czech Michael Blaner currently leading with a 5.64m clearance. 

Phil Jones' interview with Britain's Asha Philip resembles a segment of 'I'm a Celebrity' as the sprinter yelps after being attacked by a flying bug. The Briton is made of tough stuff and carries on regardless. What a pro. 

"I'm a bit disappointed in myself," she says. "I always want more. Getting injured not long before these championships was a bit of a mess, but I tried to give it a go. 

"It's my second World Championships and I've made the semi-finals both times so hopefully one day I will make a final."

From world-class heptathlete to world-class sprinter? It seems so. Dafne Schippers comes from behind, uses her power and strength to overpower her rivals in the latter stages and clocks a personal best 10.83. 

Former world champion Veronica Campbell-Brown is second in 10.89, which means 2013 silver medallist Murielle Ahoure will not be in the final later this afternoon. 

Image source, AFP

Lanes two to nine:

Jasmine Todd (USA) SB 10.92secs

Ezinne Okparaebo  (Nor) SB 11.12secs

Veronica Campbell-Brown (Jam) SB 10.99secs

Dafne Schippers (Ned) SB 10.92secs

Ivet Lalova-Collio (Bul) SB 11.09secs

Michelle-Lee Ahye (Tri) SB 10.97secs

Carina Horn (SA) SB 11.06secs

Murielle Ahoure (Civ) SB 10.81secs

Tom Fordyce
Chief sports writer in Beijing

"If you're trying to decide whether English Gardner is your favourite name in the women's 100m, it might be worth knowing that her US team-mate Tori Bowie's full first name is Frentorish."

Michael Bennett-Lee:, external Who can beat @realshellyannfp, external I really don't think there is anyone this lady is phenomenal.

Darren Campbell
Former British sprinter on BBC Radio 5 live

"I think Tori Bowie can challenge Fraser-Pryce in the final. Her technique is very smooth and if she can execute her start and drive phase she will come back on Fraser-Pryce and, if she is in the lead, I'm not sure Fraser-Pryce can catch her."