Jazmin Sawyers
European indoor long jump champion on BBC TV

We were hoping to see a smaller deficit because Kat is a lot better at the 800m but 121 points is a lot of time to make up.

Amy Lofthouse
BBC Sport in Paris

Image source, Getty Images

WOW.

A massive 54.04m for Nafi Thiam with her first throw, getting her to 939 points and leapfrogging Katarina Johnson-Thompson at the top of the standings.

That was always going to be the case, though, given Thiam's strength in this. It's going to be more about what time KJT will need to chase down in the 800m.

Nafi Thiam is so strong at this event.

The Belgian throws a huge season's best of 54.04m, nearly nine metres clear of Katarina Johnson-Thompson's best effort.

That moves her 121 points ahead of KJT as things stand - and she could still improve on that in her next two throws.

Image source, Reuters

We are about to get started in the second part of the boulder and lead final now, as climbers are frantically discussing potential routes up the wall with their coaches.

Familiarise yourself with the scoring as Hamish McArthur and Toby Roberts look to build on their respective performances in the bouldering section:

• 100 points are available.
• Climbers earn points on the last 40 moves of the route, with four points awarded for their last 10 moves.
• Three points are awarded for moves 20 to 30, two points for moves 10 to 20, and one point for moves zero to 10.

Find out more about climbing in our handy explainer.

Here we go.

I'm tense, I'm nervous, but I'm confident.

GB's Toby Roberts and Hamish McArthur are in the medal mix in the boulder and lead final.

McArthur is first up.

Matthew Henry
BBC Sport in Paris

It's hot here at the climbing. I don't know whether that helps or not.

There are hipster, straight-peaked caps and bucket hats everywhere in the crowd.

I feel very uncool.

BBC Sport

Image source, Getty Images

Cindy Sember fell in the final semi-final of the women's 100m hurdles, and spoke to BBC Sport:

"I’m ok. I’m really sad. I’m just frustrated because I have been training so hard, I’m ready – I’m sad.

"I feel I was coming to the hurdles very quickly, and I lost my control unfortunately.

"I was very ready, it’s a little hard to take in."

BBC One

Turn to BBC One now to watch Great Britain's Toby Roberts and Hamish McArthur attempt to win gold.

You do not want to miss this!

Matthew Henry
BBC Sport in Paris

So after the boulder part of this final, Great Britain's Hamish McArthur is fourth in the standings and Toby Roberts third.

Next is the 'lead' stage. Basically each climber has six minutes to scurry their way as high up this wall as possible. The higher they get, the more points they will score.

I've just been for a look at the wall and I'm glad it's them not me!

The climbers get six minutes to assess the wall and try to plan a route.

Allison Curbishley
Former GB 400m runner on BBC Radio 5 Live

That is so sad to see. Sember was making a move and then clattered hurdle seven.

So, so sad. She can't believe it.

Image source, Getty Images

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

Unfortunately for Cindy Sember, she caught up with one of the barriers early and because you're moving so quickly, make one tiny mistake, she dropped her trail foot, and no room for error, no room for any movement, you just hit the deck.

Oh no.

Cindy Sember's back leg caught the top of one barrier and sent her crashing right into the next one. She quickly gets up but is holding her shoulder.

'I'm okay, just a little sad," she tells BBC Sport.

Jasmine Camacho-Quinn and Masai Russell qualify automatically, with Jamaica's Ackera Nugent and France's Cyrena Samba-Mayela going through as the two next fastest.

BBC iPlayer

Here's what we've got coming your way on the Red Button and iPlayer heading into the early afternoon.

(All times BST)

11:30 - Athletics - Heptathlon Javelin

12:00 - Table Tennis

12:30 - Wrestling/Taekwondo/Golf

Team GB's Cindy Sember is about to run in the third and final women's 100m hurdles semi-final heat.

Also in the field is defending Olympic champion Jasmine Camacho-Quinn of Puerto Rico and France's Cyrena Samba-Mayela, who unsurprisingly gets a huge ovation from the home crowd.

How would you feel if you were Toby Roberts or Hamish McArthur right now?

They've got another 20 minutes to wait until their push for an Olympic medal reaches a conclusion.

The climbing will be shown live on BBC One from 11:35 BST.

BBC Sport

Image source, Getty Images

Ben Pattison finished fourth in the first semi-final, and was speaking to BBC Sport:

"I knew straight away that time wouldn’t be good enough. This is the Olympics, 1m 45s is not good enough.

"I’m very disappointed – I felt like I didn’t have it in me today, I don’t know why. I’ll have to watch it back, see if I ran wide , see if I did too much work early on.

"Not my day today, I let myself down but it’s the Olympics, I’m learning, I’ll learn a lot from that race but gutted.

Very unusual for him not to be able to come through at the end?

"In the first lap my legs didn’t feel right. I don’t know if that was in my head but or the pushing and shoving, whether it was something to do with that.

"But no excuses, I just didn’t have it on the day unfortunately."

How crucial could this be?

Katarina Johnson-Thompson throws a season's best with her final javelin throw, the penultimate event of the heptathlon, to add 773 points to her tally.

Main rival Nafi Thiam is in action from 11:32 BST.

Image source, Getty Images

Here's a look at the main headlines this morning in Paris:

• Britain's Toby Roberts and Hamish McArthur are in medal contention in the men's sport climbing boulder and lead final.

• Katarina Johnson-Thompson leads rival Nafi Thiam in the women's heptathlon after the long jump, with the action now moving to the javelin.
• Team GB's men and women qualify for the 4x400m relay final.
• 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.

And what's coming up in the next few hours:

• The track cycling continues from 13:00 BST with a number of Team GB athletes in action.
• The women's hockey bronze medal match between Argentina and Belgium also starts at 13:00.
• The women's football bronze medal match between Spain and Germany kicks off at 14:00 BST.
• And later on...breaking makes its Olympic debut (from 15:00 BST) - find out more as street dance comes to Paris in our guide.

Amy Lofthouse
BBC Sport in Paris

That's some grit from KJT.

She knew she had to go big on the javelin, and a season's best has put her in a strong position.

Over to you, Nafi...

Katarina Johnson-Thompson earns 773 points after throwing a season's best 45.49m to finish fourth in her javelin pool.

GB team-mate Jade O'Dowda also throws a season's best, with a 44.05 seeing her finish seventh and earn 745 points.

Remember, the stronger throwers - including defending champion Nafi Thiam - go in the second group at 11:32 BST.