Get Involvedpublished at 12:23 British Summer Time 23 August 2015
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Can anyone stop Justin Gatlin?
Summary
Usain Bolt beats Justin Gatlin to win 100m gold
Bolt wins in 9.79 seconds; Gatlin 9.80 secs
Jessica Ennis-Hill wins heptathlon gold
Johnson-Thompson 28th after long jump failure
Get Involvedpublished at 12:23 British Summer Time 23 August 2015
Ujah fifth in 10.05published at 12:22
British champion CJ Ujah was fifth in 10.05 seconds. The young Brit, who has dipped under 10 seconds in his young career, does not make the final. "It's a huge experience," says Ujah.
"To be honest, I'm not too impressed with that performance, but I hope to do Great Britain proud next year. I didn't execute my start, but I will sit down with my coach and review what happened."
'Plenty in the tank'published at 12:22 British Summer Time 23 August 2015
Gatlin cruising
Michael Johnson
BBC Sport athletics expert & 400m world record holderQuote MessageJustin Gatlin pushes back against the track and he has a patient transition. He is so smooth and such a powerful runner with a clean technique. That 9.77 was with him easing up - there's plenty in the tank and it will be very hard for Usain Bolt now.
'He looks like the clear favourite'published at 12:21 British Summer Time 23 August 2015
Gatlin cruising
Colin Jackson
Two-time world 110m hurdles championQuote MessageWill Justin Gatlin be able to push it more in the final and go under 9.7? The way he's running, he looks like the clear favourite.
Get involved using #bbcathleticspublished at 12:19 British Summer Time 23 August 2015
Image source, EPAJohn McEnerney: Bolt looked like he was leaving the pub after a massive session at the start.
Andrew Priestley: You're a very lucky boy Usain! You were frighteningly close to missing out on the final all together! Gatlin will be smiling.
'Brilliant Gatlin!'published at 12:19 British Summer Time 23 August 2015
Colin Jackson
Two-time world 110m hurdles championQuote MessageEven with all his problems you cannot take away from this man his running. He is brilliant! When you talk about how to demonstrate a 100m race, Justin Gatlin has it all. He goes under the 9.8 mark on a regular basis.
Gatlin wins in 9.77published at 12:18
How fast can Justin Gatlin go? Will he turn the screw, heap more pressure onto Usain Bolt's shoulders? Yes! A 9.77-second run from Gatlin and he looked like he could have gone quicker. Blimey. Who knows what he'll produce in the final.
The American drove well, led at halfway and maintained his pace. His compatriot Mike Rogers was second so also goes through automatically.
100m semi-finalspublished at 12:16
Semi two - GATLIN
A slight pause before the next round of semi-finalists are introduced to the Bird's Nest ticket holders. Justin Gatlin in this one, a mixed reception for the American.
Lane 2: Levi Cadogan (Bar)
Lane 3: Akani Simbine (RSA)
Lane 4: Mike Rodgers (USA)
Lane 5: Justin Gatlin (USA)
Lane 6: Aaron Brown (Can)
Lane 7: Femi Ogunode (Qat)
Lane 8: Nickel Ashmeade (Jam)
Lane 9: Chijindu Ujah (GB)
Image source, EPABrits in actionpublished at 12:15 British Summer Time 23 August 2015
There are two Britons in the men's 100m semi-finals. British champion CJ Ujah will line up against Justin Gatlin and Mike Rogers (plus others) in the second semi-final at about 12:17 (BST).
World 60m indoor champion Richard Kilty, who qualified as one of the fastest losers, goes in the third semi-final at 12:24. The biggest names in his race are Asafa Powell and Tyson Gay.
Time for the second semi-final...
Image source, PA'Not the Usain Bolt we're used to seeing'published at 12:15 British Summer Time 23 August 2015
Bolt scrapes through
Michael Johnson
BBC Sport athletics expert & 400m world record holder"He's trying way too hard in the first few metres, and not being relaxed at the start. We saw exactly what we saw yesterday. He used his long stride to get himself back into the race. He's saying to himself, 'that was ridiculous'. That's not the Usain Bolt we're used to seeing."
'Never rule out Bolt'published at 12:14 British Summer Time 23 August 2015
Darren Campbell
Former British sprinter on BBC Radio 5 live"That turbo boost Bolt has, he found it when he had to and he opened up his stride to come through. It wouldn't have scared Justin Gatlin. My head says Gatlin but I will never rule out Usain Bolt - he's done it over and over again."
Get Involvedpublished at 12:14 British Summer Time 23 August 2015
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Postpublished at 12:14
Usain Bolt shaking his head on the track. Should he leave the blocks at a snails pace in the final, Justin Gatlin will probably become world champion.
Second in that race was Andre De Grasse, also in 9.96! Trayvon Bromell was third in 9.99 and there was a Chinese record for Bingtian Su in 9.99.
Bolt under pressurepublished at 12:13 British Summer Time 23 August 2015
Colin Jackson
Two-time world 110m hurdles champion"Bolt's putting himself under pressure right at the start. He needs to be good in his first 10 metres but he pushed out so far that he almost stumbled and he had to haul himself through that field. He left himself only 80 metres to get through and that was hard for him."
'Bolt in trouble!'published at 12:11 British Summer Time 23 August 2015
Steve Cram
BBC athletics commentatorQuote MessageYou cannot start like that! If you don't start well, you are in trouble. Usain Bolt had to muster everything there just to get through!
Bolt wins semi-final in 9.96published at 12:11
Usain Bolt, as he always does, crosses himself as he crouches into position. Silence. Then - Bang.
A terrible start from Bolt, seventh at 50m... he trails up until 60m, three athletes are still ahead of him, it's touch and go whether he will finish in the top two... but he narrowly wins in 9.96.
Postpublished at 12:09
Usain Bolt says some words into the camera, I couldn't quite hear what was said, but the Jamaican looks as relaxed as ever. The semi-finalists are being introduced to the crowd. Once formalities are done with, we'll be all set to go.
100m semi-finalspublished at 12:08
Semi one - BOLT
Who's your money on? The first two in each semi-final qualify automatically, plus the two fastest losers. Here's the line-up for the first semi.
Lane 2: Julian Reus (Ger)
Lane 3: Christophe Lemaitre (Fra)
Lane 4: Trayvon Bromell (USA)
Lane 5: Andre De Grasse (Can)
Lane 6: Bingtian Su (Chn)
Lane 7: Usain Bolt (Jam)
Lane 8: Jak Ali Harvey (Tur)
Lane 9: Henricho Bruintjies (RSA)
Image source, Getty ImagesBolt on the trackpublished at 12:07
Right then. Usain Bolt is out on the track. The men's 100m semi-finals are upon us. Deep breaths. Let's not start hyperventilating just yet.
Weightman out of women's 1500mpublished at 12:06
News filtering through that Laura Weightman, who fell badly during her heat, has pulled out of the 1500m semi-finals this afternoon on medical advice. The Steve Cram-coached athlete suffered concussion and has been advised not to run. "She was dazed for quite a while afterwards," says Cram. "She's absolutely in no state to do herself justice."
Image source, Getty Images