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

This is the second part in the three part series as Usain Bolt looks to replicate his feat from London. I don't see anyone standing in his way tonight but you have to go out there and run your race. 

Adam Gemili is on the inside in lane two and it will be very difficult from him from there. 

100m bronze winner Andre de Grasse pushed Usain Bolt in the semi-final and could be a contender, while GB's Adam Gemili is in lane two.

The noise is superb!

Usain Bolt is unbeaten in Olympic finals. Seven starts. Seven golds.

Is this number eight? 

Usain Bolt v the clock. Or can someone upset the apple cart? 400m bronze medallist LaShawn Merritt is actually the fastest man over 200m this season. It would be a shock of seismic proportions is anyone pips Bolt tonight though.

ANY MINUTE NOW. 

Jade Jones' coach Paul Green on BBC One: "She always delivers under pressure. She's the most successful British athlete in taekwondo history and there will probably be no-one that will beat her. She's double Olympic champion - she's done everything."

Jade Jones on BBC One: "It feels unbelievable. I didn't realise how much pressure I would feel but to pull this off is amazing.

"I am still young so to be double Olympic champion already is crazy. I've been crying in between sessions because I was so stressed but I did it when it mattered. I'm buzzing.

"My family and friends mean the world to me, and everyone back home in Flint in the pub, their support is amazing."

That's 22 gold medals for Great Britain at these Games now. A superb haul. 

Another gold for Great Britain as Jade Jones wins gold in the taekwondo final.

Take a look at this phenomenal performance.

BBC One

Eilidh Doyle: "I can't really fault any of it. It was a smooth and solid run I just wasn't in there. I feel like I nailed the race. I am not too unhappy but you always want more. I think my hurdling was really good tonight, just need to get a bit quicker.

Not long to go now. Usain Bolt is in the warm-up track. Prowling. Stalking. Focused.

He has targeted a world record. Can he really go quicker than 19.19?!

Jade Jones does a lap of the arena, bathed and draped in flags. What a champ.

Jade Jones is only 23. Team GB have a generation of superstars almost everywhere you look. During the 1990s, if you had won double Olympic Gold you'd be turning on the Christmas Lights on Oxford Street and get your own chat show.

Now, you're in the queue. So much success. Wonderful. 

Lee Ferguson: An absolutely dominant performance by Jade Jones double olympic champion!!

Andrew Thomas: Jade Jones now a 2 time Olympic Champion. Different class

Sam Holloway: Brilliant! Olympic champion @jadejonestkd, external is now double olympic champion! That was worth staying up for. Chuffed.

Go!

USA's Ashton Eaton wins gold in the men's decathlon.

Here's Eaton's winning moment.

Jade Jones looks super cool, composed and delighted with that as she leaps into the arms of her coach and then heads off into the crowd!

She grabs a Wales flag, and a Union jack.

The rain has eased off as the athletes are introduced. Dalilah Muhammad, the overwhelming favourite, looks cool, calm and confident. Eilidh Doyle is focused, ready to go...