The second GB athlete in this final, Lorraine Ugen, also gets the crowd in a swirl with her samba rhythms. 

It's all fun and games at the moment - the competition hasn't started yet.

Brittney Reese of the US is nailed on favourite for gold. 

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

Jazmin Sawyers looks like a gymnast, she is short and has the broad shoulders. Hopefully she can pull it out today and do something good.

Jazmin Sawyers is absolutely loving being in the Olympic final. A beaming smile as her name is announced, a huge leap into the air and a dance to the samba band.

That's how you do a final. 

Where's Daley Thompson? You're up.

It's the men's 400m heats in the decathlon next on track. These incredible individuals will be looking to take as many points as they can.

Ashton Eaton leads with 3616 points so far, Damian Warner is second on 3548 and amazingly Jeremy Taiwo is just ONE point further back.

One point. That must be worth an infinitely small amount of time in the 400m...

Image source, get

We have our first automatic qualifier in the men's javelin - German Julian Weber has made it to 84.46m with his first throw.

One throw, job done, back in the hotel bar for half nine. 

There's a touch of controversy in the sand tonight. And it comes in the form of Darya Klishina.

AKA the only Russian in town.

Image source, AP

Russian track and field athletes were banned from the Olympics following claims the country ran a state-sponsored doping programme.

But Klishina, 10th in the 2015 World Championships, has been cleared to compete in her first Olympics as her drugs-testing record was established in the United States, where she is based, rather than in Russia.

Innocent party? She could be judged by the public anyway. 

Kyle Scott: Cindy and Tiffanythrough to the final! So amazing!! So proud of them both!   

Take a look at the second semi-final heat of the women's 100m hurdles in which 19-year-old Camacho-Quinn hit the hurdles twice to stop her from leading and possibly getting a place into the final.

Cindy Ofili after qualifying for the final tells BBC One: "It happened so fast. I didn't have the best of starts but I am exited for the final. It is amazing that Tiffany is also through with me, I can't put it into words."

Darren Campbell
Former British sprinter on BBC Radio 5 live

Tiffany said that she wanted her sister to finish in the top two and nobody else to go faster… she got her wish.

From what we’ve witnessed tonight there are medals out there because people are feeling the pressure, they’re hitting hurdles and destroying their chances.

The final takes place at 02:55 BST. What a night for the Ofili family! 

Despite making a strong start, GB's Tiffany Porter is unable to keep pace with the leaders and fades into fourth position with a time of 12.82s. An unlikely qualification time.

Big favourite Brianna Collins of the USA shows good form and cruises to victory, clocking 12.47s.

Steve Cram
BBC athletics commentator on BBC TV

Tiffany is through to the final and so is her sister. All is well and right in the world.

Nikitta Holder took a really heavy fall in that semi-final, but got back to her feet. 

Cindy Ofili is into the final in second place in that semi...and Tiffany Porter makes it through too!

Two fallers in that third semi. 

Top two through to the final - here they go!

Cindy Ofili has ran 12.66 this year. She may need to get close to that here. 

This needs to happen!