The men's 800m semi-finals are about to begin, with Team GB's Ben Pattison in heat one

World bronze medallist Pattison is second quickest in the field. He’s up against fast-finishing Algerian Djamel Sedjati, who scorched to world-leading times in Paris and Monaco last month.

Mike Langley
Commentator on BBC TV

Roberts read it like a book up there. Perfect.

It was really awkward, like trying to squeeze a tomato ketchup bottle.

That is what Toby does.

Image source, Reuters

That will settle her down.

Katarina Johnson-Thompson has made a very good start, throwing 44.64m - the highest in this group so far.

Toby Roberts is back and he's on wall three.

He could really do with 25 points to put him right in contention.

Roberts does just that! The pressure was on and he secures the points.

He's into second place.

Here we go then.

The penultimate Heptathlon event - the javelin - is about to start and it is arguably Katarina Johnson-Thompson's weakest, though she has a PB of 46.14m from last summer.

She leads Nafi Thiam by 45 points, but Thiam is very strong in this discipline so damage limitation is key.

We won't know the full picture for a while though because Thiam is in the second group that starts at 11:32 BST.

Image source, Getty Images

Mike Langley
Commentator on BBC TV

That is an insane move!

Look at this. McArthur just rockets off the five point hold and gets onto the 10. I don't think we'll see anyone try that today.

Image source, PA Media

GB's Hamish McArthur is back out again and he's attempting wall four.

It's a brilliant move to jump up to the 10 point hold and attempts to swing his way to the 25 pointer, but can't quite reach.

The crowd love it and he gives them a wave, what a performance.

Mike Langley
Commentator on BBC TV

The class ultimately showed through [for Anraku] there. It was such a difficult method but it worked for him.

The control to hold that rotation, because your body is wanting to go the other direction.

Image source, EPA

Japan's Sorato Anraku becomes the first man to complete the second wall and take his points total to 49.6 - knocking GB's Hamish McArthur down to second.

Hugely impressive from Anraku especially considering he's only 17!

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

We were looking at where Britain could improve and Alex Haydock Wilson would certainly make a difference in second to get Britain into that 2m 57s mark, and if you are in that mark you certainly got a chance.

GB's Toby Roberts, like everyone else, failed to complete wall two but he did manage to reach the 10 point mark.

He's now on 33.4 points ahead of the third wall.

Team GB named a strong quartet, including Matt Hudson-Smith and Charlie Dobson, because they were in a tough-looking heat and it has paid off, finishing second behind runaway leaders Botswana to reach Saturday's final.

Young Quincy Wilson struggled in the opening leg and gave his USA team-mates plenty to do, but a strong anchor leg from Chris Bailey sees the reigning Olympic champions through in third.

Here's GB's Toby Roberts back for a go at wall two.

No one has conquered this wall yet, will he be the first?

Mike Langley
Commentator on BBC TV

McArthur is in a really good position here, but he has called it quits on that third climb.

Image source, PA Media

Now it is the turn of the GB men in their 4x400m relay heat.

They are again in the same heat as USA, who have been crowned champions at eight of the 10 most recent Olympic Games.

The USA team includes 16-year-old Quincy Wilson, the youngest male Olympic track and field athlete in the country’s history.

BBC iPlayer

The athletics action is continuing on BBC One and iPlayer with the 4x400m relays. Don't forget that Katarina Johnson-Thompson's next event in the heptathlon is the javelin at 10:25 BST.

You can also watch the climbing on BBC iPlayer and Red Button with GB's Hamish McArthur and Toby Roberts going well.

Great Britain's Hamish McArthur's third run is now over and he's put in a great effort here after only just qualifying for the final.

McArthur currently leads on 44.5 but there's still a way to go.

Here is how Team GB finished second in their heat to make it through to Saturday's women's 4x400m relay final.

Image source, Getty Images

• Great Britain's Hector Pardoe came sixth in the men's open water swimming marathon in the River Seine, which was won by Kristof Rasovszky of Hungary.

• Katarina Johnson-Thompson continues to lead rival Nafi Thiam in the women's heptathlon after the long jump.