Could Britain have a medallist in the 400m hurdles tonight?

Eilidh Doyle goes in lane one, and will have to produce a monstrous personal best to get near the top three.

American Dalilah Muhammad has clocked 52.88 this year - well over a second faster than Doyle has managed. 

World champion Zuzana Hejnova has been out of sorts this season but looked good in her semi-final...

Image source, Getty Images

Liz Carlisle: Come on Jade Jones, bring it on home  

Nicola: Stayed up to watch Jade Jones in the #Taekwondo, external so lets hope she can smash this and bring gold back to North Wales  

Andy Wallace: Decided to get up to watch the taekwondo and then #boltdown, external . Who needs sleep?   

Is a shock on the cards in the women's javelin?

Croatia's Sara Kolak, ranked 10th on distances in 2016 coming into the Games, leads the final with a huge throw of 66.18m.

South Africa's Sunette Viljoen is in silver spot and Maria Andrejczyk is in bronze position.

There is a slight delay, leading Nick Hope to do some top-class filling on BBC One for us. It's all going to go off at once isn't it?The decathlon 1500m is under way. 

Basically, kick them in the head. 

This is how Jones won her semi-final...

Nick Hope
BBC Sport in Rio

Jade is such a fighter. Today she will not talk to the media, she shuts down into that bubble she is in. When she is outside of competition she is nice and relaxed but when she is out there competing she is super focused.

In contests comprised of three two-minute rounds, athletes attempt to score points with kicks to their opponent's head and kicks or punches to the torso. Each blow is worth between one and four points. 

Read more here.

Aimee Lewis
BBC Sport in Rio

Jamaican and Brazilian flags are dominating this evening in the Olympic Stadium, but there are plenty of other countries being represented: France, Canada, Britain, USA. It would probably make a decent quiz. 

Holding one of the Union flags aloft is Mia Richardson, from Hexham. 

She's been talking to me about Usain Bolt. "He's the athlete that got me interested in athletics," she says. "I was 10 when he did what he did in Beijing. The ease with which he won. I follow him on snapchat and he's hilarious." 

Image source, .

Jade 'The Headhunter' Jones is just five minutes away from an Olympic gold. At worst, she has a silver. What a position to be in.

The big moment is approaching for Jade Jones.

The Welsh fighter takes on Spain's Eva Calvez Gomez in the final of the taekwondo -57kg category.

Like triathlete Alistair Brownlee, she's looking to defend her title from London 2012.

She tweeted this before the Games:

GB's Lynsey Sharp worked very hard for that and is rewarded by a second place finish behind the perpetually serene Caster Semenya.

Jade Jones is just 15 minutes away from defending her taekwondo -57kg category title against Spain's Eva Calvez Gomez.

The Welsh fighter is looking to win Great Britain's 22nd gold medal at the Rio Games.

British reigning champion Jade Jones is one win away from another Olympic taekwondo gold medal after reaching the final of the -57kg category in Rio.

The Welsh fighter, 23, won 9-4 in her semi-final against Sweden's Nikita Glasnovic.

Jones won at London 2012 to claim GB's first Olympic gold medal in the sport and is the current European champion.

The top seed will now face Spain's Eva Calvo Gomez, who is seeded second, in the final at 02:00 BST on Friday.