We are rapidly approaching the denouement in the men's triple jump, the six remaining contenders are making their final jumps.

Pedro Pichardo still sets the standard with 17.55m... until now!

Italy's Andrea Dallavalle, who was fifth, has leaped a massive personal best of 17.64m and jumps into first place.

He celebrates with a giant roar. What a moment.

Botswana's Letsile Tebogo won the Olympic gold, but can only settle for fourth here despite running 19.65 seconds - a season best, and 0.01 secs off Levell in third.

GB's Zharnel Hughes finishes fifth despite a season best 19.78. He mixed it with some of the best of all time, and could not have done much more.

Image source, Getty Images

It is a US one-two, as Kenny Bednarek has to settle for silver once again. A season best of 19.58 secs is just 0.06 behind Noah Lyles.

Bryan Levell of Jamaica wins bronze with a personal best time of 19.64. The 21-year-old has been a sensation at these championships. We will hear a lot more from this young star in the future.

Image source, Getty Images

Who would doubt that man?

With his curly, dyed orange hair streaking behind him, Noah Lyles edges out this stellar field and wins gold in 19.52 seconds.

He matches Usain Bolt's record of four world 200m titles in a row.

Love him or loathe him, he is a superstar.

The men are on their marks.

See you on the other side.

Olympic gold medallist Letsile Tebogo.

The irrepressible Noah Lyles, who could equal Usain Bolt’s record of four 200m world titles in a row.

Olympic silver medallist Kenny Bednarek is after a first major title.

21-year-old Jamaican Bryan Levell has been a revelation.

British record holder Zharnel Hughes.

Who are you backing?

This has the potential to be one of the most remarkable finals in recent years, with a plethora of talent all in realistic medal contention.

GB's Zharnel Hughes, unable to make the 100m final, secured his place in the 200m medal race as he followed three-time defending champion Noah Lyles across the line in his semi.

Lyles produced a statement performance in his favoured event. The American did not ease up while well ahead in the semi and crossed the line in a world-leading time of 19.51 seconds.

This race also features the Olympic champion, Botswana's Letsile Tebogo, and Paris silver medallist Kenneth Bednarek of USA.

Add in the extremely impressive Jamaican Bryan Levell, and his could be one for the ages.

Image source, Getty Images

Time for the blue riband events of the day - the 200m finals.

The men are first up.

Harry Poole
BBC Sport in Tokyo

Katarina Johnson-Thompson needed a big finish in that 200m to keep Anna Hall within reach.

She did well to hang on and match the American to ensure she ends day one in the medal positions.

All the heptathletes can now head off for a very well-earned rest before returning tomorrow morning. Can Johnson-Thompson launch herself up the standings? Anything can happen still.

So, that's day one done in the heptathlon.

Anna Hall of the United States leads from Kate O'Connor of Ireland with 4,154 and 3,906 points respectively, while Katarina Johnson-Thompson has moved back up to third after a strong 200m - she has 3,893 points.

Three-time Olympic champion Nafi Thiam of Belgium has slipped from second to sixth after finishing last in her 200m heat.

Great Britain's Abigail Pawlett and Jade O'Dowda are split by just two points, sitting 14th and 15th with respective 3698 and 3996 scores.

Pawlett may wonder what might have been, she was running well before falling in the fastest 100m hurdles heat, and has performed well in the three subsequent events.

We return tomorrow for the final three events.

British heptathlete Katarina Johnson-Thompson, speaking to BBC Sport: "Tough timetable today, normally the events are more spread out through the day but this was back to back to back - that shows in the 200m times.

"It was a solid day, I've had a lot better and a lot worse. Now I just need to go home and recover.

"My day two has got better in recent years. I'm excited for long jump tomorrow, also got my shot put, but third after day one is good overall."

It's a strong run for Great Britain as they take first and third in the final heat of the heptathlon's 200m.

Abigail Pawlett wins with a time of 23.25 seconds - the best of the three races - from Katarina Johnson-Thompson's 23.51.

Standings leader Anna Hall of the United States is in between them with a 23.50 finish.

Because the heats are seeded on past performance, the six fastest times in the 200m were in this race.

Two British athletes in the final 200m heat - Abigail Pawlett, who fell in the hurdles at the start of the session, and two-time world champion Katarina Johnson-Thompson.

They're next to one another in lanes eight and nine.

KJT requires a fast time if she's going to haul herself back into contention for a medal.

Jenny Meadows
Former 800m World Championship medallist on BBC TV

It's just starting the process - the nutrition, seeing the physio, maybe getting an ice bath, going back to the hotel and refuelling.

They will know they can have a nice lie-in tomorrow.

Maria Vicente takes the second of the three 200m heats, winning with a season-best time of 23.96 seconds.

Australia's Tori West and Adrianna Sulek-Schubert of Germany are second and third.

Bad news for the Japanese fans, as their greatest hope for gold at these championships has not even made the final.

Olympic and world champion Haruka Kitaguchi of Japan returned a month ago after an elbow injury, and is clearly not at her best as, following the second qualifying group, has not reached the overall top 12 she needed to make the medal event.

Better news for European champion and current world distance leader Victoria Hudson though, the Austrian throwing 62.85m to guarantee a spot in the final.

Ireland's Kate O'Connor is having a fantastic day.

After setting personal bests in the 100m hurdles and high jump, she adds a third with a 24.07 seconds finish in the heptathlon's first 200m heat.

She's runner-up to Emma Oosterwegel of the Netherlands, who also won her hurdles heat and gets a 24.03 PB of her own.

Jade O'Dowda of Great Britain is seventh with a season-best 25.07.

What a rollercoaster few minutes for USA's Rai Benjamin - his 400m hurdles world title has now been reinstated following an appeal.

Benjamin, who won the final by a significant distance, was disqualified after he clipped his final hurdle - which inadvertently nudged a rival's hurdle out of place on the neighbouring lane.

It was a harsh call, and has been overturned. It means Benjamin is now officially world and Olympic champion.

The crown Benjamin was wearing when he was told of his disqualification is now firmly back on his head. Good for him.

Image source, Getty Images

So after three events, Anna Hall of the United States extends her lead at the top of the heptathlon standings.

She leads with 3,125 points, ahead of Nafi Thiam of Belgium and Kate O'Connor of Ireland who have 2,978 and 2,932 points respectively.

Katarina Johnson-Thompson slips from joint-third to joint-sixth.

We're heading straight into the 200m heats, with Jade O'Dowda lining up in the first race.