An epic night.

Let's do it all again tomorrow yeah?

Host nation Brazil have beaten Russia to progress to the final.

Watch their winning moment.

Tyson Gay on USA's DQ: "Hell, we already did the victory lap and then when we talked to TV, they told us.

"They said Justin Gatlin got the stick before the zone. He's saying he didn't. Hopefully we can appeal."  

It's been a wonderful day/night of emotions out in Rio, but the upcoming Paralympics look like being chaotic.

As budget cuts are announced for the Paralympics in Rio, Paralympic wheelchair racer Josh George said the cuts were 'disappointing' and 'it almost makes you feel like a second class citizen'.  

Bolt's nine golds...

Lutalo Muhammad: "It was a roller coaster of emotions today, but hey I still won three fights. Unfortunately I literally just came up short at the last second in the final. Obviously it's disappointing for me. I wanted to be the Olympic champion today, but I just have to settle for silver.

"I'm very happy to be here, second-time Olympian, second-time Olympic medallist- bronze, silver, so we know what's next."

ThinkBig33: So nice hearing the girls talk positively and about the pride for each other.  

Asha Philip: "We came here to get a medal and we delivered. We had a lot of pressure to get this, but we had so much trust and faith in these girls. I have been with the senior team since 2011. We didn't even make it four years ago and I have to thank all the girls from 2012 because it has helped us so much. I am so happy. Thanks to these girls and those at home."

Desiree Henry: "I cannot believe it. This was my first Olympics I wanted to go out and enjoy it but also to get a medal. To do it I had tears in my eyes. Thank you to everyone who has made this happen."

Dina Asher-Smith: "I am so proud of these girls. We have worked unbelievably hard. Out of all the teams I think we worked the hardest. We have worked so hard and this for the entire nation."

Daryll Nieta: "I am speechless. I am so proud of our team. I am happy we have this faith and trust in this team. We absolutely smashed it."

Image source, AP

Michael Johnson said earier on tonight that he though that Justin Gatlin would carry on.

Sounds like - as ever - he was right.

Here's Gatlin: "I never said this was my last Olympics. This Olympics has made me hungry for the world championships next year (in London). I'm 34. You guys thought I couldn't run this fast at 34. At 35 I'm going to be even faster."

On finding out about the disqualification while celebrating the third-place finish in the stadium:

"It was the twilight zone. It was a nightmare. You work so hard with your teammates, guys you compete against almost all year long. All that hard work just crumbles."

Jos van der Lelie: Upsets and shocks, achievement and disappointment, big winners and big losers. Drama and emotion in #Rio2016, external. What a great day  

An emotional Lutalo Muhammad spoke to BBC Sport following his last gasp defeat in the final.

This is an extremely powerful sporting interview...

Make the most of this video. It's the last time we'll see him at an Olympics...

Rhuban: So much drama during these final few days!  

Monica Lee: Usain Bolt loves Steve Cram's commentary. Don't we all?   

Special word for Steve Cram at the end of Usain Bolt's interview. "Steve, this is because of you. This is why I talk to this guy," while pointing to Phil Jones. 

Poor Phil.

Asafa Powell: "It was never in doubt. We went out there very confident. We are a team and we love competing on the track. I love running with these guys. We are here to relax, we are very confident we just want to get the stick in that man's hands."

Nickel Ashmeade: "We went out there and executed it and did well."

Yohan Blake: "That was all of us. Usain need to be immortal and he is immortal. I will encourage him to come back for 2020."

Usain Bolt: "I am proud of myself and I have to say thanks to the guys. The pressure is real. I look at it as accomplishment. I live for these moments, it is beautiful and I came through. I'll go home, stay up late tonight talking and having fun. It is not real. It is a brilliant feeling. I told the guys if it didn't happen tonight I would beat them up. I am the greatest."

Image source, Reuters

If you've been inspired by tonight's action in the Olympic Stadium, why not have a go yourself?

You can find out how to get into all types of athletics in our special guide.