Darren Campbell
Former British sprinter on BBC Radio 5 live

Usain Bolt is chatting to a South African athlete. Do you really think he wants him to win? He's planting seeds of doubt. That's how it is. This is the final, this is the fairytale for Bolt.

Will he get it? We are about to see. But whatever tactics he needs to use now to get into heads, use them.

Listen to Darren, click 'BBC Coverage'.

Allison Curbishley
BBC athletics expert on Radio 5 live

Image source, BBC Sport

If the others believe they can beat Bolt and don't get intimidated then we could see a massive upset. We all want Bolt to win. Probably everybody but Reece Prescod's family want Bolt to win. It's spine-tingling!

Michael Johnson
Four-time Olympic gold medallist athlete on BBC TV

That area in the call room is where some races can be won and lost. Coleman has been in those rooms before just not at this level. He needs to duplicate those college level performances.

The men's 100m field stroll down a corridor from the call room to the main arena. Christian Coleman is at the head of the queue, looking dead ahead.

Usain Bolt laughs at a big cuddly mascot clowning, giving the impression that this is a done deal in his mind.

Image source, PA

Usain Bolt prowls in the bowels of the stadium, spots a camera watching him and pulls a conspiratorial wink and shush gesture.

Tonight he is aiming to restore his tally of global gold medals to 20 after Nesta Carter's positive test saw him lose one of Olympic relay golds.

Luvo Manyonga drops back into the sand pit and flutters his angel wings in celebration.

A former crystal meth addict, reformed and refocused,, external he then shares a prayer with team-mate and bronze medallist Ruswahl Samaai.

A great story. United States Jarrion Lawson comes up just short and takes silver.

Mo Farah is not shy about his pick for the 100m. He has posted a picture of Usain Bolt, with whom he shares an agent and a lot of history.

Mace Windu: Well that 200m wasn't too shabby from KJT. At least it's a slight consolation for her high jump performance !

Mike Costello
BBC Radio 5 live athletics commentator

If we were to stop now and go to the last event, the 800m, she'd have to beat Yorgelis Rodriguez by five seconds. Of course, positions will change between now and then but at the moment, KJT is right back in it.

JENKINS: Still unsure why Tony Minichiello isn't coaching KJT. Surely the final ingredient she needs to realise her great potential?

Toni Minichiello
Jessica Ennis-Hill's coach on BBC TV

You see the drive in Katarina and her working hard. You also see her smile. She has confidence in this event. The body position is what you want and she worked the bend really hard. She picked that point on the finish line and drove for it. A great performance. Her feet just need to be a bit stiffer so they bounce.

Mike Costello
BBC Radio 5 live athletics commentator

Johnson-Thompson knows at least she has made up some ground. That was one of the best 200m runs of her career and just what she needed after a difficult day.

Unofficially, it looks like she has moved up from 13th to fourth.

Listen to Mike and the 5 live team, click 'BBC Coverage' in this page.

Katerina Johnson-Thompson gives a weary pump of the fist as she crosses the line.

That is only seven hundredths of a second away from her personal best.

Unofficially that move the Briton up from 13th to fourth in the overnight standings.

Britain's Katarina Johnson-Thompson now to try and make up some of the damage caused by an underwhelming high jump and shot put.

She gets a rousing reception as her name is announced and acknowleges it a little sheepishly.

Luvo Manyonga is still the man out in front in the long jump.

The South African world leader is ahead of the rest on 8.48m. The United States Jarrion Lawson is in second, but time is running out him and everyone else.

Only one jump left.

Tom Fordyce
Chief sports writer at London Stadium

Bolt's 100m final winning times at World Champs: 9.58 secs in 2009, 9.77 secs in 2013, 9.79 secs in 2015.

The semis earlier this evening were slow - 10.10 got you into the final. So what will it take to secure gold this time? 9.88? Almost time to place your bets.

The shots have just come in of the 100m contenders warming up backstage.

Usain Bolt, side-by-side with team-mate Yohan Blake, stretches off his long limbs like Caros Acosta at the barre.

Christian Coleman is wrapped up in a hooded top and layers, swaying and muttering like a young Tyson as he readies himself for the ring walk.

Reece Prescod, the lone British representative, goes through his routine solo and solitary.

Here's what Radio 5 live's Darren Campbell makes of it.

Heptathlon leader Nafissatou Thiam on BBC One: "It was a good day. We did some middle performance like the hurdles and shot putt. I didn't do any mistakes. The challenge is to do OK and then some big performances in some areas. It is easy to do mistakes in seven events."

Nafi Thiam is the new Karl Malone. She always delivers.

The Belgian runs a 24.57 200m, just 0.17 seconds off her personal best at the event.

She keeps putting in the solid performances and she is going to finish the opening day at the top of the heptathlon standings.

Image source, Reuters