Image source, Getty Images

No man has won both 200m and 400m gold at the same championships since the great one, Michael Johnson in 1995.

Can Wayde van Niekerk double up this time? He breezed into the 400m final by running 44.22 over the weekend and that remains his stronger event.

Mind you when you can run the 100m in under 10 seconds, the 200m in under 20 seconds and the 400m in under 44 seconds you don't really have a weak event...

Van Niekerk is in heat three.

Yohan Blake jogs a 20.39 200m to win his heat with ease. Also through are Abdul Brown of Japan and Alex Wilson from Switzerland.

Image source, Reuters

Tom Fordyce
Chief sports writer at London Stadium

A grey but warm early evening in the London Stadium, with arguably the highest quality contest of the championships to bring it to a peak. The women's 1500m is stacked - world champion Genzebe Dibaba; Olympic champion Faith Kipyegon; the fastest woman in the world this year, Sifan Hassan; Caster Semenya, Olympic champion over 800m. And then there are the British two - national record holder Laura Muir, double Olympic finalist Laura Weightman. Pick the right 1-2-3 out of there and beyond and you're doing well.

Yohan Blake is in the first 200m heat. A 19.26 man at his best - ludicrously fast. He may get through a second slower than that tonight.

The first three go through in each heat remember.

UK Sport has set Great Britain a target of six to eight medals. Mo Farah's gold in the 10,000m on Friday is the only medal Britain has won so far. That total could improve tonight as double European indoor champion Laura Muir goes in the 1500m final.

Kelly Sotherton, former British heptathlete, told BBC Radio 5 live: "We're supposed to have home advantage and the team will look at things they can do better, but it's a bit premature to judge the British performance this early. We should have this conversation next weekend."

Image source, EPA

"There are lots of great youngsters who could potentially use this home advantage and step up. We can't be too downbeat at the moment.

"We have put so much pressure on the team and that hasn't been dealt with very well. The success of the championships - are they viewed on how many medals the team win or how well we've hosted the championships?"

Image source, Getty Images

Got the athletics buzz? Been for a run round the park after work already? Chucked the dog's toy ball the length of the garden and then measured it?

Let me know your thoughts on tonight's action and maybe tell me your greatest ever athletic achievement. Keep it believable though. Particularly keen to hear from any amateur hammer throwers tonight.

You can get us at #bbcathletics or by texting us on 81111 (UK Only).

BBC Radio 5 live

As we have over the weekend BBC Sport brings you the World Championships across TV, radio and online tonight.

Following two hours of football chat from 19:00 BST on 5 live attention switches to London Stadium where the athletics team will take you through all that's going on until the day is run.

On BBC Two, the action is now live until 20:30 BST when the show will switch over to BBC One. A key reminder - you can access 5 live and BBC One/Two in this live page. Just click 'BBC Coverage'.

Fill your boots.

Sam Bryant
BBC Sport at London Stadium

Image source, BBC Sport

This is one of the most popular gathering points for fans while they wait for the action to start. It's the only place inside the London Stadium that gives a decent vantage point of the athletes' warm-up area and gives the fans a chance to get really close.

Many will hide away in the tents, so you have to be patient if you're waiting to see someone in particular. On Friday, Mo Farah received a huge cheer as he emerged to do some light work before his 10,000m final. This was relayed onto the stadium's big screens, the crowd's first chance to see Mo that evening, resulting in even louder cheers!

Image source, Getty Images

The men's 200m is the first event on track, kicking us off just after 18:30 BST.

The top three in each heat go through, plus three fastest losers.

South Africa's 400m Olympic champion Wayde van Niekerk is one of the busiest athletes in London as he seeks to win double gold. He is competing over six consecutive days and this is the third race of his packed schedule. Britain's Danny Talbot, Zharnel Hughes and Nethaneel Mitchell-Blake also feature.

Here's what's coming up over the next few hours then, with British athletes in brackets.

18:30 - Men's 200m first round (Danny Talbot in heat three, Zharnel Hughes in heat six, Nethaneel Mitchell-Blake in heat seven)

18:35 - Men's triple jump qualifying (Nathan Fox in group A)

19:00 - Women's hammer final (Sophie Hitchon)

19:30 - Women's 400m hurdles first round (Jessica Turner in heat two, Eilidh Doyle in heat four, Meghan Beesley)

Image source, Getty Images

20:20 - Men's 400m hurdles semi-final (Jack Green in heat two)

20:25 - Women's triple jump final

20:55 - Women's 400m semi-final (Zoey Clark in heat three)

21:30 - Men's 110m hurdles final

21:50 - Women's 1500m final (Laura Muir & Laura Weightman)

Hello there! A British gold on the track? A British medal in the hammer?

It could* happen before bedtime tonight. London Stadium is ready for another epic night of track and field and we may** even see a world record to boot.

Let's get this party started

Image source, Getty Images

*May not happen

**Probably won't happen