That's all from us both tonight, thanks for joining.

Same again tomorrow? See you then.

Want to watch more between then and now?

BBC Red Button

The live action from Doha will be back at 21:30 BST with the 20km race walk featuring GB's Tom Bosworth and Callum Wilkinson.

You will be able to watch that on the Red Button and on the website.

A short but sweet session in a packed Khalifa Stadium - here's a recap of everything that has happened:

• British trio Neil Gourley, Jake Wightman and Josh Kerr reach men's 1500m final
• GB qualify for the men's and women's 4x100m relay finals
• Steven Gardiner of the Bahamas wins 400m gold
• Cuba's Yaime Perez was crowned women's discus champion
• Home hero Mutaz Essa Barshim retains men's high jump title
• Conseslus Kipruto nabs victory in the men's 3,000m steeplechase final
• Dalilah Muhammad sets a new world record in the women's 400m hurdles final

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

The stadium was as full as we've ever seen it. The energy in here was fantastic.

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

Gardiner was running very relaxed. He looks like an 800m runner but he's got 200m speeds.

He's a much faster athlete than Fred Kerley and Gardiner just ran a great 400m, executing it perfectly. It means everything to him.

Great to see another 400m runner like Gardiner come here and deliver his best performance and win the gold medal.

Gardiner goes to sixth on the all-time list with that time.

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

At 300m, you couldn't call who the victor was going to be. Gardiner gave absolutely everything.

He held his form and he used Fred Kerley to guide him through the first 150m, then attacked with 50m to go.

Andrew Cotter
BBC Sport commentator in Doha

Such a talent! His whole career he's had injuries, he's had problems, he's always looked so good - and it's finally all come together.

The Bahamas had to fundraise to get athletes here, and now they've really got something to celebrate. That was sensational.

Oh my word. Gardiner is FLYING. Here he comes.

James goes round the final bend well. But here comes Steven Gardiner...

Kerley flies out of the blocks and Gardiner has a lot of ground to make up.

They're off.

Saj Chowdhury
BBC Sport in Doha

Are we going sub 43.5 here?

Light show time. It's epic.

Following the bizarre semi-final exit of Michael Norman, the fourth fastest 400m runner of all-time, the clear favourite in this one will be US champion Fred Kerley (lane five).

Grenada’s Kirani James (lane seven) has only raced eight times since winning Olympic silver in 2016 because of autoimmune condition Graves’ disease; a medal of any colour for the former Olympic and world champion would be a popular outcome.

Steven Gardiner (lane four) won silver two years ago and he has looked good so far.

Right, we've got another final coming up.

BBC Sport

Katarina Johnson-Thompson on Nafi Thiam: "I'm definitely aware what it's like to come second and not medal and that's given me so much hunger in the past. Nafi will go away with that and she's already a phenomenal athlete. I'm fully prepared that she'll come back.

"It's a big team around me. It was difficult to negotiate the timetable with the heptathlon and decathlon being on at the same time. I had people sending my coaches videos and feedback. It's a huge team effort.

"I've enjoyed how quick it's all been. I had breakfast yesterday and then went back to bed, which I absolutely loved!"