Paula Radcliffe
Women's marathon world record holder on BBC TV

Mo will be under no illusions, he knows he will be up there to be shot at. He knows there is nothing the Kenyans and Ethiopians would love more than to stop him. 

Mo is a stronger, happier and more stable person this season. He knows he has done everything he can do to be in the best shape.

Shelly-Ann Fraser-Pryce posted a season's best time finishing first in the 100m second semi final. British runner Asha Philip was eighth in that semi-final in a time of 11.33.   

Since doing the 5,000m and 10,000m double at the London Olympics in 2012 Farah has completed the double at the subsequent two World Championships in Moscow in 2013 and Beijing in 2015, as well as doing the same in the European Championships in Zurich in 2014.

That is some pedigree.

Steve Backley
Four-time European javelin champion on BBC TV

Wow. That throw may have just clinched Jess Ennis-Hill another Olympic medal. She is exceptional over 800m.

That is just what she would have wanted and it is a good start for her.

That throw of 45.91m is not the best so far but Jessica Ennis-Hill is so good over the final event - the 800m - that it is just the ticket. 

Close enough? 

Here comes Jessica Ennis-Hill with her first throw in the javelin, her PB is 48.33m, she looks calm and WOW!

Fetch that one. 45.91m. Beautiful. 

Fastest in the world this year Elaine Thompson wins the third semi in 10.88 seconds, with American English Gardner second in 10.90.

FAST. 

Here's GB's Greg Rutherford's first jump reaching over eight metres.

There's 32 athletes out there trying to reach the pole vault final at the moment, so it's not the fastest moving event of the night.

Great Britain's Luke Cutts has safely navigated 5.30m on his first attempt, while Renauld Lavillenie, the French athlete who is the hot favourite to take gold, is yet to jump.

Greg Rutherford hits the board - over eight metres once more but it's only 8.11m.

No need to panic just yet - the athletes get six jumps in the final. For way of reference Greg won gold in London with 8.31m. 

Paula Radcliffe
Women's marathon world record holder on BBC TV

I think Mo is definitely in the shape to do it.

It will be a huge achievement if he does. That has to be underlined because we have got so used to him going out and winning that we take it as given. 

I think he has that fear factor and dominance over the rest of the field.

How are we doing? It's about to get a little bit silly now.

Greg Rutherford is in action in the long jump.

Jessica Ennis-Hill is just about to start in her javelin in the heptathlon.

Mo Farah goes in the 10,000m in 10 minutes.

Darren Campbell
Former British sprinter on BBC Radio 5 live

'If you want my 100m title, you will need to come and get it'.

That's what the Olympic champion Shelly-Ann Fraser-Pryce said to her rivals there. 

This will be one of the closest 100m finals we have ever seen and it will be down to who can hold their nerve. Fraser-Pryce has done this twice before and knows what it feels like but the others don't.

Jarrion Lawson has just jumped 8.19m to move into second. It means Greg Rutherford is in third after one jump each.

The top three have jumped 8.20, 8.19, 8.18.

It doesn't get closer than that! 

As Germany's Christoph Harting wins gold, he makes the most of the occasion!

Check out his celebration here.

British runner Asha Philip was eighth in that semi-final in a time of 11.33. 

Amy Johnson: I've been watching athletics for many years, but doing so at 1am is a first! Nice first jump from Greg, phew!

Soph: Thanks Greg Rutherford for making that first jump because I'm close to a heart attack.

Reports of Shelly-Ann Fraser-Pryce's downfall may have been wide of the mark!

She wins her semi in 10.89, a great run! But there's a hint of a limp afterwards, a grimace. Is she hurt?

Dutch athlete Dafne Schippers was a narrow second.