How Bolt won 100m gold

• 18:30 (BST): Max Whitlock, gymnastics floor exercise - Gold 

• 19:02: Nick Dempsey, windsurfing - Silver 

• 19:46: Justin Rose, golf - Gold 

• 20:13: Max Whitlock, pommel horse - Gold

• 20:13: Louis Smith, pommel horse - Silver

• 21:52: Jason Kenny, cycling sprint - Gold  

• Callum Skinner, cycling sprint - Silver

• 01:04: Andy Murray, tennis - Gold 

Usain Bolt reacts to BBC Sport after 100m win

It's a fantastic time for the sport from a performance standpoint but from the other side the sport has a huge credibility problem.

I was talking to someone about world records and there is doubt. If the only way to stop people suspecting you is by running slower then the sport has a huge problem.

The IAAF has to handle this and restore credibility otherwise people like Wayde van Niekerk will have the injustice of people questioning them. That's the fault of the federation not doing enough to ensure the sport is clean.

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You looked tired out there in the fourth set: "I was tired. We played four hours. That's hard on this surface. On a slow court that's a lot of running it was physically hard and I served badly which made the match tougher than it was already.

"The last few months since the clay court season started I've been competing for the biggest events in every tournament. I've had some good wins against the top players."

Can you now challenge Djokovic in a way you haven't before? "Novak has played with amazing consistency for the last couple of years. What I've done for four months he's done for two years."

Earlier on - before athletics took over - Andy Murray retained his Olympic tennis title.

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The Olympic champion tells reporters: "Tonight is one of the toughest matches I've had to play for a big title.

"The US Open for my first slam was hard. Physically there were so many ups and downs in the match. It was one of the toughest I've played for sure.

"Anything could have happened. This one means a lot but I won't get the chance to enjoy it as much as I'm playing a match in 48 hours."

On retaining Olympic gold: "The fact it's not been done before shows it's very hard so I'm proud to have done that. Four years is a long time and so many things can change. A lot has changed since 2012, I'm happy here competing for the biggest events. Who knows about Tokyo in four years. At 33, I'm not sure I'll be at the same level."

Apparently, after Bolt had secured his seventh Olympic gold, he went to congratulate Wayne van Niekerk, who gave his best attempt at upstaging the main men shortly before in beating Michael Johnson's 400m world record.

"He told me 'I told you, I told you, you could do it'," Van Niekerk told BBC Sport.

Not a bad bloke to have in your corner, he certainly knows his stuff... 

Usain Bolt loves a selfie but would you put your hand on his head and ruffle it?

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APCopyright: AP

Wayde van Niekerk, who broke Michael Johnson's world record to win the 400m earlier, told BBC One: "I have dreamed of this since forever, since I was a kid. I asked the Lord to carry me through, I even wrote it on my spikes. I am blessed.

"I believed it was possible. I am just glad things went my way tonight. I thank Michael Johnson for setting such a great example for us. I just did my best tonight.

"I am grateful and blessed to be surrounded by such great sports people of my generation."

Time to hear from the 100m Olympic champion.

"I'm really happy but I expected to go faster," Usain Bolt tells BBC One. "I'm just happy that I won and that's the key thing.

"After the semi-final I felt extremely good. I wanted to run faster but with the turnaround time, we normally have two hours, but we had one hour 20 minutes, it was challenging. This is what we train for. I told you guys I was going to do it. Stay tuned, two more to go."

On the crowd's reaction that saw Justin Gatlin booed when entering the arena, Bolt added: "For me I was surprised. It is the first time I have come into a stadium and they booed someone. It was shocking."

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• 2008 Olympic Games, Beijing - 9.69 - world record 
• 2009 World Championships, Berlin - 9.58 - world record 
• 2012 Olympic Games, London - 9.63 - Olympic record
• 2013 World Championships, Moscow - 9.77
• 2015 World Championships, Beijing - 9.79 
• 2016 Olympic Games, Rio - 9.81

He's slowing down...

Usain Bolt: "Somebody said I can become immortal. Two more medals to go and I can sign off. Immortal."

Andy J: Usain Bolt is beyond awesome. What an absolute hero. There are no words for how good the 100m Olympics final is.

Janine Pingree: Usain Bolt is such a great ambassador for his sport and a worthy champion.

Becca Grice: Set my alarm to see Usain Bolt - what a man, what a legend!

Jubril: The triple triple is on.

That it is Jubril. But we never doubted it, did we?

After the semi-finals I felt extremely good but we did not have a long turnaround time after the semi-final so it was challenging.

The triple treble is on without a doubt.

Getty ImagesCopyright: Getty Images

Justin Gatlin: "We work 365 days a year to be here for nine seconds."