AAF world championships Usain Bolt's last race Live stream

Usain Bolt started the final countdown to his retirement by guiding Jamaica through to the 4x100m relay final this morning.

The eight-time Olympic champion anchored the squad to victory in the second heat.

Jamaica finished in 37.95 seconds - slower than Great Britain and the USA from the first heat - but will be expected to challenge for the podium in tonight's final - Bolt's last race of his career.

Great Britain - with Danny Talbot, Adam Gemili, Nethaneel Mitchell-Blake and CJ Ujah - qualified second behind the USA in 37.76secs in the first heat with Talbot hunting a medal.

"Definitely, that's what we focus on, that's what we want to do. It's a great time to do it in front of a home crowd so hopefully we can do it this evening," he told the crowd during a trackside interview.

The women's squad of Dina Asher-Smith, Asha Philip, Desiree Henry and Daryll Neita qualified in a season's best of 41.93 seconds by finishing second, also behind the USA.
Philip said: "We definitely embraced the opportunity. None of us competed here in 2012 so to have this crowd is breathtaking. They really carry you around over every changeover."

What are they saying?

Usain Bolt

"For me it's hard to be sad because of the energy I am getting from the crowd, I just feel happy and blessed.
"It's been brilliant, the energy in the stadium is outstanding. I knew it was going to be like this, I appreciate you guys coming out and supporting not just me but the whole World Championships."

What's our prediction?

Jamaica won gold in Rio last summer and it's difficult not to back Bolt to bow out on a high in London this time around.