Japan's Ririka Hironaka led the women's 10,000m final for the first 10 minutes or so, but she falls off the front as the favourites take centre stage.

Agnes Jebet Ngetich, Beatrice Chebet and Gudaf Tsegay lead the way as the pace picks up.

There's a group of six at the front, with a huge gap separating them from the closest chasers.

Great Britain's Zharnel Hughes has been speaking to BBC Sport after progressing through his men's 100m heat: "I wanted to get through the first round, dust the cobwebs off and trust in myself. I know I have great top-end speed so, despite whatever happens next to me, I just have to focus on myself and focus on my execution - that's what I did.

"I'm in excellent shape right now. I just need to execute things now, that's all."

Romell Glave faced a nervous wait after he finished fourth in heat one of the men's 100 metres.

During the six heats that followed, nobody matched his time of 10 seconds, meaning he qualifies for the semi-finals as the fastest non-automatic qualifier.

He's joined by Britain's Jeremiah Azu and Zharnel Hughes, who qualified automatically despite not matching Glave's time.

Here comes the women's 10,000m final!

World record holder and two-time Olympic champion Beatrice Chebet of Kenya is favourite, but don't rule out her compatriot Agnes Jebet Ngetich, who is the world record holder on the road.

Great Britain's Megan Keith and Calli Hauger-Thackery are involved, as is defending world champion Gudaf Tsegay of Ethiopia.

Perhaps due to the humid conditions in Tokyo, the pace after the first lap is pretty pedestrian.

21-year-old Chinese sprinter Deng Xinrui flies out of the blocks in the final 100m heat, but falls behind as South Africa's Akani Simbine powers away to win the final heat in 10.02 seconds.

Abdul-Rasheed Saminu of Ghana takes second with 10.09, with Kenya's Ferdinand Omanyala third in 10.12.

Japan's Abdul Hakim Sani Brown received a great reception, but finished seventh.

Good news for Great Britain - Romell Glave qualifies for the semi-finals as the fastest non-automatic qualifier.

Great Britain's Scott Lincoln speaking to BBC Sport earlier after qualifying for the shot put final: "It was a nervy one but I'm through to my first world final. Here we are, how do you like your eggs? I've made big changes and taken a big risk but I'm starting to get the rewards now, hopefully. I'm happy with what I've thrown but I still feel there's more I can do in the final.

"I'll go all out in this final, what have I got to lose? This year in particular, I think the medal is anyone's. There are definitely medals up for grabs, so why not me?"

Colin Jackson
Two-time world 110m hurdles champion on BBC One

Israel Okon was charging, wasn't he? The Nigerian is only 18 years old. It's nice to see youngsters coming to a tournament like this and not feeling overwhelmed by it. He will have watched all of these athletes perform in the past as a young teenager, but he wants to go and compete with them now.

He was out of the blocks so quick and strong, he was just gathering more and more pace by 40 metres, his eyes were straight in front.

Zharnel Hughes was nice and controlled. He pulled himself through without that much effort, he's just doing his thing.

Image source, Getty Images

They're away this time!

The 18-year-old Israel Okon gets off to a flier and takes the heat in 10.04 seconds, while Zharnel Hughes qualifies having powered back in the second half of the race to finish with 10.06.

Marcell Jacobs takes the last qualifying spot with a season-best 10.20.

Here's Great Britain's Zharnel Hughes in heat six - he won world bronze in Budapest two years ago, but struggled in 2024 with injuries.

Marcell Jacobs, who won gold at the Olympics here three years ago, is also in the blocks - he has the joint-worst season best of the field with 10.30.

The athletes are called back after a false start - the officials seem to be looking at T'Mars McCallum.

It seems he was out of the blocks one thousandth of a second too quick, and all athletes can start again.

United States' Noah Lyles has been speaking to BBC Sport after progressing through his men's 100m heat: "That was a ton of fun. It was way better than last time, I could hear my thoughts echo off the wall last time I was here.

"My form is the best it's ever been in my life. Am I going to finish strong? Always."

Image source, Getty Images

We're not quite done with the men's 100m heats yet, but the men's shot put final is now also under way.

Ryan Crouser hadn’t competed all year prior to the overnight qualifying round because of an elbow injury, but the American is seeking a third straight world title to add to his three successive Olympic gold medals

Great Britain's Scott Lincoln is looking to compete after coming fifth overall in the heats.

Great Britain's Jeremiah Azu has been speaking to BBC Sport after qualifying for the semi-finals in the men's 100m: "It was pretty smooth. I think I got out quite well, transitioned quite well and then I just maintained it. I didn't want to leave it to chance so I wanted to make sure I qualified in the top three.

"It's been a couple of weeks since I last raced so it was all about getting back in that rhythm and I did that. It felt good and the track is quick. I'm ready to roll and excited for what's next. I'm confident in my abilities."

Olympic 200m champion Letsile Tebogo of Botswana has struggled in the 100m this season, but he wins heat five with a time of 10.07 seconds.

The experienced Andre De Grasse of Canada takes second in 10.16, with Courtney Lindsey of the USA third with 10.19.

It's so far so good for Great Britain's Romell Glave - with two heats to go, he remains the fastest non-automatic qualifier with his time of 10 seconds flat. The nerves will be kicking in.

Colin Jackson
Two-time world 110m hurdles champion on BBC One

Jeremiah Azu did so well. He would've got this start-list last night, looked at it and thought he's going to have to work his way into the heat to qualify outright.

He did such a tremendous job. He got out the blocks very well and he just maintained it, even with a lot of good people around him. That's going to be key for him - he has to know his competition well but also trust himself.

He didn't stress or strain, he just kept his focus on the prize. A solid performance.

That's a British qualifier!

Jeremiah Azu takes the third qualifying spot from heat four, finishing with a time of 10.10.

United States national champion Kenny Bednarek wins the heat with 10.01, while Canada's Jerome Blake was second.

Image source, Getty Images

Colin Jackson
Two-time world 110m hurdles champion on BBC One

Noah Lyles did very well there - 9.95 seconds is a very decent run indeed from him.

He said he's going to race his way through these World Championships because he hasn't had that many races this season. It works well for him having so many rounds because he can really gather pace throughout.

He has definitely got something building.

Great Britain's Laura Muir has been speaking to BBC Sport after failing to qualify in the women's 1500m heats: "I don't know what happened and I think that's the most upsetting thing. I feel like I've had a bit of a disrupted year but I was coming into form really well. I was excited with the shape that I was in so I was definitely aiming to make the final and be competitive in that final. I'm not too sure what went wrong, to be honest, which is the most upsetting thing.

"I did realise something wasn't quite right with 500 metres to go, I tried to just put it to the back of my mind but it showed in that last 100 metres.

"When Faith [Kipyegon] went to the front I didn't realise she was going to push on, so I just sat on her shoulders so that I was out of harm's way. I think I ran a really good race apart from the last 100 metres.

"This has probably been the hardest journey I've had to get to the World Championships, so to have gone out in the first round makes it really difficult."

Image source, Getty Images

It's Noah Lyles time.

The reigning Olympic and world champion is only the joint-12th fastest man in the world this year, and didn't begin his outdoor season until July because of fitness issues.

No bother though - the American starts well and wins in 9.95 seconds.

Jamaica's Ackeem Blake finishes second in 10.07, with Terrence Jones of the Bahamas third in 10.16.

Steve Cram
BBC Sport athletics commentator on BBC One

Kishane Thompson is such a big and powerful guy. He kind of rocks and rolls as he gets up and gets into that drive-phase, then he starts to smooth out as those legs of his really come to the forefront.

Once he gets up to that top speed, it is very impressive. He didn't need it all here, in fact he eased right back at the end of that heat.

Great Britain's Romell Glave has been speaking to BBC Sport after equalling his personal best in the men's 100m heat one: "It was good. The start was a bit confusing because Oblique [Seville] didn't get out so I thought there was going to be a call-back, but I was just able to continue on. I did tighten up at the end but I still went and equalled my personal best.

"It was a bit of a weird situation at the start because I was wondering if he was going to call it back. You just have to get on with things and hopefully I get through now. I just have to see how everyone else does."