Men's 200m finalpublished at 13:56 British Summer Time 27 August 2015
They've been called to their blocks... We're seconds away from the green light...
Summary
Bolt (19.55) wins 200m gold from Gatlin in silver (19.74)
GB's Zharnel Hughes fifth
USA's Allyson Felix wins 400m for ninth world title
Christine Ohuruogu eighth in 400m
GB's Sophie Hitchon fourth in hammer final
Asher-Smith wins 200m semi in 22.12
GB's Oskan-Clarke wins 800m semi-final
Men's 200m finalpublished at 13:56 British Summer Time 27 August 2015
Where will the race be won?published at 13:55
Darren Campbell
Former British sprinter on BBC Radio 5 live"To generate the speed round the bend is always difficult, and that is the area Gatlin has to put Bolt under pressure.
"When Bolt is in the straight that's his part of the race, that's where he gets to relax and open up his stride. Gatlin will have to jump all over him around the bend.
"Will Gatlin be able to close him down and put Bolt under pressure in the first 60m?"
Image source, Getty Images'Bolt will win'published at 13:55
Quote MessageI am predicting Bolt to win. Gatlin will push him all the way, he might even come off the bend first, but Bolt is so special and hopefully he has the fitness.
Injured British sprinter Adam Gemili on Radio 5 live
'200m final will be a great race'published at 13:55
Michael Johnson
400m world record holder on BBC TVQuote MessageWith Bolt not being at his best and Gatlin being at his best it makes for a great race. Part of the beauty of this sport is the close competition of events like the 200m and the debate about who will win.
'Zharnel has a great chance of breaking GB record'published at 13:54
Men's 200m final (13:55 BST)
Let's not forget about Britain's Zharnel Hughes. Former European 200m champion John Regis thinks his British record of 19.94 seconds could be beaten by Hughes today.
"Zharnel has really stepped up this season," Regis, who has held the British 200m record for 22 years, told BBC Radio 5 live.
"He's gaining massive experience by being in this final and has a great chance of breaking the record today.
"He's drawn inside the two stallions of the 200m and if he can somehow hold on to Bolt and Gatlin's shirt tails they will be able to drag him through to sub-20 seconds."
Men's 200m finalpublished at 13:54
Men's 200m final (13:55 BST)
The headline acts are on their blocks, being introduced to the crowd. Goosebumps. Usain Bolt kisses his vest and simply says "let's go".
Vote result - Bolt will winpublished at 13:53
So a majority 73% of you think Bolt will win this final and only 20% of you are backing Gatlin.
GB's Zharnel Hughes got 5% of the vote.
'Who will win? Bolt'published at 13:52 British Summer Time 27 August 2015
Michael Johnson
400m world record holder on BBC TVQuote Message"I think Bolt has got a lot more to give on the bend and a little bit more on the straight. "There is more to come, although I don't think it will be anything particularly special by his standards. "Gatlin knows he is going to have somewhat of a challenge from Bolt. Who will win? Bolt."
Does the lane draw matter?published at 13:53
Tom Fordyce
Chief sports writer in Beijing"The draw has once again been kind to champion Usain Bolt," writes our chief sports writer Tom Fordyce.
"Gatlin will start in lane four, with Bolt outside him in lane six, separated by Britain's Zharnel Hughes, winner of the other semi-final.
"The more gradual curve in six both suits Bolt's physique and leaves him free to run his own race without a rival up alongside him. Gatlin, by contrast, will have the fastest man in history in his eyeline all the way.
"It could act either as a magnet or a weight around his neck. And only if he is already level with Bolt can he in turn enter his rival's thoughts."
Image source, Getty ImagesWho is in superior 200m shape?published at 13:51
Men's 200m semi-final 13:55 BST
Here's how it is: Justin Gatlin set a world lead and a personal best 19.57 seconds in Eugene in late June; He has run four of the best six 200m times this year, with his 19.87 semi-final win in Beijing the fourth quickest of the year.
If the race was won on season's form, Gatlin would take it by a huge margin.
But Gatlin's legs turned to guacamole after 95m of the 100m so can he hold his nerve and his form to win gold this afternoon?
Image source, BBC SportGatlin and Bolt - the sequelpublished at 13:51 British Summer Time 27 August 2015
Nine world titles, six Olympic gold medals, the reigning champion and world record holder... how can Usain Bolt lose?
But for the 200m, read the narrative of the 100m: the people's favourite below his best while his rival, unpopular on these islands so it seems for twice failing doping tests, has dominated the distance over the last two years.
Bolt dipped below 20 seconds for the first time this season in winning his semi on Wednesday in 19.95 seconds, while running half a lap in 19-and-a-bit seconds has been routine for the American. Deep breaths, five minutes until it begins.
Image source, BBC SportMen's 200m finalpublished at 13:49
Talking of Usain Bolt...
Image source, EPAFelix the greatest?published at 13:48
'Felix is a phenomenal athlete'published at 13:48
Quote MessageThat was phenomenal from Allyson Felix. She got out so quickly it put pressure on Christine. It's amazing to see her do this and defend the title for Team USA. I am so glad to call her my team-mate.
Injured Olympic 400m champion Sanya Richards-Ross on Radio 5 live
Image source, PA'Soul-destroying for Christine'published at 13:47 British Summer Time 27 August 2015
Women's 400m final
Steve Cram
BBC athletics commentator"When Allyson Felix comes past you after 100m what does that do to you psychologically - it must have been soul-destroying for Christine.
"It was one race too far for Christine."
Image source, ReutersNo medal for Ohuruogupublished at 13:47 British Summer Time 27 August 2015
Darren Campbell
Former British sprinter on BBC Radio 5 liveQuote MessageChristine kicked early because she tried to close the gap on Allyson Felix which is why she had nothing more to give down the straight. She should have stuck with her race.
Image source, AFPFour PBs in 400m finalpublished at 13:46
Shaunae Miller of the Bahamas takes silver in a personal best 49.67, while Jamaica's Shericka Jackson goes home with a bronze, also recording a personal best 49.99. Quick, quick, quick.
'Astonishing'published at 13:44 British Summer Time 27 August 2015
Women's 400m final
Andrew Cotter
BBC Sport commentator"That was an astonishing performance from Allyson Felix."
Ohuruogu eighthpublished at 13:42
Christine Ohuruogu is hunched on the track, begging her lungs to produce more oxygen. The Briton has lost her title, coming home last in 50.63 seconds. All the finalists are breathing heavily, Fleix - claiming her ninth World Championship gold - has punished them.
Felix becomes 400m championpublished at 13:41
Allyson Felix out of the blocks like a greyhound, leading coming into the final bend... Surely her legs will never forgive her for setting off at such a pace? But they carry her through to world championship gold. Magnificent. A world leading 49.26.
Image source, AFP