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."

Kishane Thompson, the 2024 Olympic silver medallist, goes in heat two - he was pipped by Noah Lyles in an incredibly tight finish.

He has an unrivalled five sub-9.90 times this year - Lyles has none - but missed the final three Diamond League meetings last month due to discomfort in his shin.

No issues here, he's powered ahead of the field by half way, takes a look around and slows down over the line, still finishing with a time of 9.95 seconds.

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

Oblique Seville was literally sleeping in the blocks. His reaction time was more like that of an 800m runner rather than a sprinter.

When you're a quality athlete like that, at least he has the ability to haul himself back in and run down people that are running personal bests left, right and centre.

Romell Glave running 10 seconds flat in fourth-place - wow. It's shocking that he even has to wait to see if he qualifies, but unfortunately that's what's got to happen.

Image source, Getty Images

Up comes Romell Glave, the first of three British runners taking part in the men's 100 metre heats.

The Brit finishes fourth with a joint-personal best of 10 seconds - he'll have to wait and see if he's one of the three fastest non-automatic qualifiers.

South Africa's Gift Leotlela wins with a PB of 9.87 secs, followed by Kayinsola Ajayi of Nigeria, with a PB of 9.88.

Oblique Seville of Jamaica finishes third after terrible start, but still manages to clock 9:93.

Jenny Meadows
Former 800m World Championship medallist on BBC One

Laura Muir was showing some really good signs coming into these World Championships. She came second in the British Championships to qualify for Tokyo, which was amazing, and she did it with a sprint finish. More recently, she came fourth in the Brussels Diamond League.

It was such a shame to see her fade towards the end of that race. It will be interesting to hear what happened from her perspective.

Very disappointing. She did well to make this team but then we were expecting her to at least make the semi-final.

Right, it's time for the men's 100m heats.

The top three from each of the seven heats will be guaranteed a place in the semi-finals, along with the next three fastest finishers overall.

Paula Radcliffe
Former women's marathon world record holder on BBC One

Laura Muir needed to be at a quicker pace, so when the pace lifted again she just couldn't quite find enough. It's perhaps the result of not having enough training in her legs to be able to respond because it was a big pick-up.

Faith Kipyegon did well to yo-yo that pace and that's a difficult way to run.

It's a comfortable win for Faith Kipyegon, going through with a time of 4 minutes 02.55 seconds, but disaster for Great Britain's Laura Muir.

She fades dramatically on the final straight, slipping to eighth and out of the qualification places.

It means Revee Walcott-Nolan is the only British athlete to progress to Sunday's semi-finals.

Image source, PA

Harry Poole
BBC Sport in Tokyo

Shout out to the man providing you images of the racing happening down the back straight during the distance events.

While the pictures may look as steady as the ones coming from the electronic camera which is moving up and down along a rail beside the home straight, over on the far side of the track it's a bloke quite impressively filming while balancing on what appears to be a single-wheeled hoverboard.

Can he keep up with Kipyegon? Time to find out.

Paula Radcliffe
Former women's marathon world record holder on BBC One

Laura Muir is definitely trending in the right direction. How good was it to see her back to see her back to her old self in Brussels over that final lap?

That race will have done her a lot of good coming into these World Championships because she has just continued to build on it.

She is running smartly here because she doesn't need to challenge or go in front of Faith Kipyegon. It's all about making sure you're in a good position and staying out of trouble.

Faith Kipyegon has led out this fourth and final heat, as we head into the final lap.

Great Britain's Laura Muir is up alongside her, while Ireland's Sarah Healy is also placed well.

Image source, Getty Images

Paula Radcliffe
Former women's marathon world record holder on BBC One

Poor Esther Guerrero had absolutely no place to move to and Sophie O'Sullivan just found that clear space.

I think O'Sullivan's legs were tired rather than throwing herself over the line. She was in that position anyway, so I think it was just fatigue kicking in. She was giving absolutely everything.

Harry Poole
BBC Sport in Tokyo

Faith Kipyegon ran past me in Yoyogi Park the other morning and certainly looked in shape to me.

It's a bit easier to accept when it's a serial gold medal winner leaving you in their dust...

The Kenyan great remains the big favourite to claim a fifth consecutive global 1500m gold, at the end of a season in which she attempted to become the first woman to run a sub-four minute mile.

Many have already hung this gold medal around her neck, but you can't take anything for granted amid the chaos of the 1500m.

Freweyni Hailu of Ethiopia wins heat three with a time of 4 minutes 01.23 seconds.

Sophie O'Sullivan, daughter of Sonia, takes the sixth and last qualification spot for Ireland despite stumbling on the finish line.

Now, here comes Faith Kipyegon in the fourth and final heat.

We've got some British interest too with Laura Muir in the field.

Great Britain's Jazmin Sawyers has been speaking to BBC Sport after failing to qualify for the women's long jump final: "I'm gutted. That's one of my worst competitions of the year. I feel like so many people put in such hard work to get me here and I just wish I could've made their work mean a little more. It's great to have made it back to the team, but I'm never really here to just make teams. I have bigger goals than that.

"I just didn't do enough. It's hard because I look at it and I feel as though I had done everything leading into this, but now I've got to go back this winter and do more. I don't feel like I've given everything to the sport that I can and there's no excuse for that."

Image source, Reuters

Paula Radcliffe
Former women's marathon world record holder on BBC One

That heat was easy for Nelly Chepchirchir. It just underlines the fact that she now finds herself up there challenging for those medals.

It was a good race from Revee Walcott-Nolan. She made the move when she needed to and put herself in a good position. She didn't have much left in the tank in that closing straight, but she had built up enough of a buffer over fast-finishing Lucia Stafford.

Faith Kipyegon is coming in heat four, but another Kenyan, Nelly Chepchirchir comes through in first in heat two.

She finishes with a time of 4 minutes 07.01 seconds, meanwhile Great Britain's Revee Walcott-Nolan progresses from sixth with 4:08:67.

The 30-year-old came ninth in last year's Olympic final.

Jenny Meadows
Former 800m World Championship medallist on BBC Two

Armand Duplantis still looks like he's enjoying competing. He could definitely be forgiven for thinking that he's already done enough in the sport, but he will know what he thinks his potential is. His world record is 6.29m - I think there's only two guys in the world that have cleared 6m this year so we've got a whole ruler gap there.

He does bring his best performances to the major championships. He brings the drama and the excitement. He has brought such a highlight to the pole vault event.

Image source, Getty Images

Pole vault superstar Armand Duplantis has just made a mockery of his first qualifying attempt.

The double Olympic champion opts to start at 5.55 metres, and sails so high over the bar that he could have read a newspaper on the way over.

The Swede has already broken his own world record twice this summer - will he do so again in Tokyo?