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

I'm not sure we got huge questions answered on how much Jess Hull had in the tank, but she certainly had enough to be able to control that heat with ease.

Often when you're coming into these World Championships and you have high expectations for a medal, you just want to come through the first heat smoothly, safely and feeling good.

Australia's Jessica Hull takes heat one in the women's 1500m with a time of four minutes 04.40 seconds.

Hull took silver in Paris last year, becoming the first Australian, male or female, to win an Olympic middle-distance medal on the track since 1968.

Great Britain's Erin Wallace finishes eighth with 4:06:07 and won't progress.

Dame Jessica Ennis-Hill
Three-time world heptathlon champion on BBC Two

Jazmin Sawyers has had such a tough year. An Achilles rupture is incredibly difficult to come back from. She didn't just come back though, she came back putting out great jumps and qualifying for the World Championships.

So although at this moment she is going to be bitterly disappointed, she can look back at a fantastic season.

The qualifying has been completed for the women's long jump and Great Britain's Jazmin Sawyers has failed to make the final.

The 31-year-old, who only returned from a long-term Achilles injury in May, managed a best of 6.54m from her three jumps.

6.60m was what was needed to be one of the 12 qualifiers, while Tara Davis-Woodhall, who hasn't lost a long jump final since taking silver the world championships two years ago, managed the best jump with 6.88m

Jenny Meadows
Former 800m World Championship medallist on BBC One

Faith Kipyegon has been a talent since becoming a junior athlete. She is going for her fourth World Championship title, she has won over 5000m as well, and she is trying to do the double once again here.

She has to be the red-hot favourite. As the rounds progress we will see what shape she's in, but she's already set a world record this year in case we were debating the shape she's in.

Harry Poole
BBC Sport in Tokyo

Well, that has certainly whet the appetite for tomorrow evening.

Shelly-Ann Fraser-Pryce received a fitting welcome when she was announced to the crowd, and is one of several athletes to produce statement performances.

Among them, that season's best run from Daryll Neita is very promising, after she went agonisingly close to achieving a first individual global medal in Paris last summer. You could see how pleased she was with that.

And still we have the men's heats to come. Some line up for the opening night.

Image source, Getty Images

Domination.

That pretty much sums up Kenya's Faith Kiypegon and the women's 1500m.

The 31-year-old has won three successive golds in the Olympics and taken first place in three of the last four world championships.

She's not slowing down either - she set a new world record in June with a time of three minutes 48.68 seconds.

She goes in the last of four heats that are just about to kick-off, with semi-finals tomorrow and the final on Tuesday.

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

Marie-Josee Ta Lou-Smith and Shelly-Ann Fraser-Pryce might be the old-timers, but they can still upset the apple cart. They always manage to sneak their way through with their wealth of experience.

Remember, they have both ran under 11 seconds this year. They are still capable of performing when it matters, so they will be happy to be through to the next round."

Great Britain's Amy Hunt has been speaking to BBC Sport after coming through her women's 100m heat: "We knew it was going to be a really long hold and set after the practice yesterday, but that was a very long hold! Today was all about getting my name on that start-board, I really didn't care about anybody else's name I just wanted to see my own name in that top three - and that's the job that I did today.

"We always see that I warm-up through the rounds but I think that was a pretty solid heat run for me so I'm pretty happy. I'm just trying to get back as quick as possible and roll on the recovery for tomorrow.

"I had some really lit starts in the warm-ups but I need to actually be able to do that in the race and not just in the warm-ups, so we'll see if I can put it together a bit better tomorrow. I'm just happy to be through."

Last heat - and it's Shelly-Ann Fraser-Pryce time.

There's a wealth of experience in this heat and it shows - Fraser-Pryce, aged 38, progresses to the semi-finals in second with a time of 11.09 seconds.

Marie Josee Ta Lou-Smith of Ivory Coast, just 36 and twice a world championships medallist in the 100m, wins this one with 11.05, while 19-year-old Liranyi Alonso of the Dominican Republic is third.

Great Britain's Daryll Neita has been speaking to BBC Sport after progressing through the women's 100m heats: "It was seriously amazing out there. I have such good memories here in Tokyo. I went to sub-11 seconds for the first time here and I made my first Olympic final here.

"Just to come here and execute like that in my first race, after what has been a season, is showing myself that it's all about trusting and believing. I'll let the running do the talking for the rest of these World Championships.

"When I came out here, I just had goosebumps because this place holds such special memories for me and my career. I feel good and I'm just going to head back, recover and get ready for tomorrow."

Image source, PA Media

Next up is Great Britain's Amy Hunt, who last month clinched her first national outdoor title with a PB of 11.02 seconds.

Today the 23-year-old takes second place after a slow start, finishing in 11:13.

European indoor champion Zaynab Dosso of Italy takes first place in 11:10, with Kayla White of the USA third with 11:16.

Trinidad and Tobago's Leah Bertrand clocked 10:92 earlier this year, but could only manage 11:29 and finish in fourth place.

Dame Jessica Ennis-Hill
Three-time world heptathlon champion on BBC Two

Amy Hunt's indoor season will have been a really big lift for her. She has shown us and herself that she can contend over the short distance. It's fantastic to see her journey and the way she's got here.

She has been very consistent this year and she looks to be hopefully peaking at the right time.

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

Daryll Neita knew that if she just ran her own race, she would qualify. That's the luxury of her position at the minute.

She has raced everywhere and she has found out where she needs to make alterations to arrive at these World Championships in tip-top condition. She has been here before, and made the finals on numerous occasions, so she knows exactly what's necessary.

This was a very good and competent run from Neita - a season best when it matters. I don't think that's the best we're going to see from her either.

Image source, Getty Images

If you're counting on a world record to be broken in this championship, Armand Duplantis is probably your man.

The 25-year-old has set a record in the men's pole vault on 13 occasions, including three times this year.

The qualifiers for his event get going today, with a final to follow on Monday.

Meanwhile you can read all about the Swedish sensation in our profile of him here.

Time for the second of three Great Britain runners in these heats - it's Daryll Neita.

The 29-year-old finished fourth in Paris last year, just 0.04 seconds behind bronze medallist Melissa Jefferson of the United States.

Neita storms through to take the heat with a season-best 10.94, some way ahead of Twanisha Terry of the United States who finishes second with 11.06.

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

Control is what it's all about for Julien Alfred and she's definitely just shown that.

There were no real nerves or anxiety for her so she wasn't going to be the sharpest out of the blocks because it's not necessary. She already knows she has the strength and the 10.70s in her belt, so it wasn't going to be an issue if she slept in the blocks but she didn't even do that.

It's great to see how she's controlling the 100m running. She loves to put her foot on the gas from 20 to 40 metres and it looked like she was just brushing out some of the cobwebs.

Harry Poole
BBC Sport in Tokyo

Hopefully you can just about pick out the big group of Jamaican fans in yellow and green sat by the finish line.

They're in prime position for tonight's 100m heats, and will soon savour the sight of watching Shelly-Ann Fraser-Pryce compete at her final championships before retirement.

They will hope she has a couple more races to come after this seventh and final women's 100m heat.

What a story it would be if she could sign off with a 25th global medal, 18 years after her first here in Japan.

We're seeing big hitter after big hitter - here's Olympic champion Julien Alfred of St Lucia.

Alfred begins her quest for a first world medal in the easiest way imaginable as she jogs over the finishing line in first place in heat four.

Salome Kora of Switzerland and Audrey Leduc of Canada progress to the semi-finals in second and third place respectively.

United States' Melissa Jefferson-Wooden has been speaking to BBC Sport after her women's 100m heat: "It feels good to be back on the track. I've been here about a week now so I've just been waiting around getting ready to run. We've got the first run out of the way so now it's time to get ready for the semi-finals and then move on to the finals.

"I don't believe I'm the one that needs to be catching everyone else. I'm not a reigning Olympic champion in the 100m so I'm still seeking those titles. Obviously this year is the World Championships, so that's what I've been looking forward to."