Sally Gunnell's event. Always will be.

The top four go through and Olympic champion Dalilah Muhammad has no issues in her heat. She is well clear by the home straight and can ease down to win in 54.59. That was routine.

Image source, Reuters

Sage Watson, Denisa Rosolova and the superbly-named Sparkle McKnight are all also through.

Linford is in the house! Mr Christie shakes hands with Justin Gatlin, who is wrapped up for a winter's day.

There are reports that Isaac Makwala - who missed the 200m race but hopes to compete in tomorrow's 400m final - has been struggling with food poisoning.

Image source, Reuters

Sophie Hitchon likes her second throw on release, but it's not quite as long as she first thought.

It's a marginal improvement though - 71.62m, keeps her in fourth.

Massive favourite Anita Wlodarczyk is on the edge though. A foul in her second throw means that she is only sixth so far. The top eight get three more throws after their third effort.

Next on track it's the first round of the 400m hurdles, with the first four in each race going through to the semi-finals.

Olympic champion Dalilah Muhammad of America is also a 2013 World Championships silver medallist and the favourite. Six Americans have the 13 fastest times this year and she is top of that list.

Jessica Turner of Britain goes in the second heat, while Eilidh Doyle and Meghan Beesley will also be hoping to get safely through.

Image source, Getty Images

We can confirm that British runner Zharnel Hughes is through as one of the fastest losers in the 200m.

Sophie Hitchon is fourth as it stands - but this first effort put her briefly into the lead.

Nice! A good run from Nethaneel Mitchell-Blake as he races Aaron Brown of Canada to the line. It's given to Brown in 20.08, but NMB gets the same time.

Zharnel Hughes talking to BBC Sport: "I got out a little bit too slow. I made up ground in the home straight and tried to stay relaxed as much as possible. I will work on my start until the next round. Today was a warm-up and hopefully I'll get through to the semis and improve."

Zheng Wang of China has thrown 74.31m in her opening throw - she takes the lead.

Image source, Reuters

Michael Bennett-Lee: 1 jump and qualified that is why @Taylored2jump, external is the best in the world - no the best ever, period.

LTH London: Men's 200m heats! Love the 200m. That would have been my event if I pursued athletics

We have another British athlete in the seventh and final heat as Nethaneel Mitchell-Blake lines up. He's a sub 20-second man at his very best.

Zharnel Hughes has run 20.22 this season but he's never in contention and can only finish fourth in his heat. That's not enough for an automatic place in the next round.

Isiah Young of the US wins it in 20.19, Hughes has clocked 20.43. He might be OK.

Image source, Reuters

Image source, Getty Images

Plenty to keep us occupied and entertained tonight but if you're the sort of person who only tunes in for medals, there are four golds on offer this evening.

The women's hammer - which has started - the women's triple jump, the men's 110m hurdles and the women's 1500m will have champions tonight.

Can a British athlete or two get amongst the medals? Here's hoping...

Image source, EPA

Defending world triple jump champion Christian Taylor qualified for the final with 17.15m.

He tells BBC Sport he wants to break Jonathan Edwards' 22-year-old work record of 18.29m: "It's all about having fun and going after that magic number. I've jumped 18m this year and now I'm in good shape. It's a big target on my back. I want to do something that makes history. I want to jump 18.30m-plus. So grateful for the British supporters."

So then, Sophie Hitchon. A huge roar greets the British hammer thrower as she enters the cage. It's over 70m, she likes it. Beaming smile.

It's 71.47m! Into the early lead.

The women's hammer final has started and the rain has joined the athletes in London. Not good news for the competitors. At all.

Massive favourite Anita Wlodarczyk steps up - and it's not up to her usual standards at all. She clips the cage and that's barely over 70m.

70.45 in fact.

British athlete Zharnel Hughes is in the next heat.

Image source, Reuters

A shock all the same in heat six as Jamaican Warren Weir, bronze medalist in the 2012 Games, is fourth in a six-man race! He does not go through automatically.

Sydney Siame wins in a Zambian national record of 20.29 seconds.