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By Saj Chowdhury
BBC Sport at Doha
Britains Dina Asher-Smith underlined her standing as preferred for the domain as she seamlessly qualified for Wednesday.
The 23-year-old world 100m silver medallist won her semi-final in 22.16 seconds - the fastest time of the afternoon.
Her hopes of being the first British woman to win a world sprint name increased with the withdrawal of winner Elaine Thompson.
The closing at the Khalifa Stadium of Doha begins at 20:35 BST.
Compatriots Jodie Williams and Beth Dobbin didnt qualify for the final.
Asher-Smiths time proved to be a third of a second quicker than the next fastest qualifier, USAs Brittany Brown. American winner Anglerne Annelus also characterized by winning her semi-final in 22.49.
The stars look aligned for Asher-Smith together with Jamaicas Thompson linking winner Shelly-Ann Fraser-Pryce, 100m bronze medallist Marie-Josee Ta Lou and Dutch defending champion Dafne Schippers one of the principal contenders to get pulled away. Nigerias Blessing Okagbare, whod run faster than the Briton this calendar year, was disqualified in her heat on Monday.
And to race, Bahamas Shaunae Miller-Uibo, that won the 200m Diamond League trophy by beating the European winner in Zurich, elected ahead of the championships in the 400m because of the scheduling.
Elsewhere, it was another day for the squad.
Nick Miller, ranked fourth in the world, qualified for Wednesdays hammer finished with a throw of 76.36m. The Commonwealth winner, who had been only one of 3 men to throw over 80m would be the first British man medallist at a casting event since javelin silver was won by Steve Backley in 1997.
Rabah Yousif was the only Briton to meet the requirements to the 400m semi-finals of Wednesdays men since he finished third in his heat. European winner Matthew Hudson-Smith needed to be assisted off the track and endured an accident.
I am surprised I felt great. I wasnt too stiff so I simply had to come along and give it a go, said Yousif, that has competed in two 4x400m races.
I need another couple of gears.
Grenadas Kirani James, who won the world title in 2011 and gold in London 2012, has been the fastest qualifier within 44.94 moments. Fred Kerley and USAs Michael Norman, just two of the favorites having both run under this year, are also.
Olympic and world champion and world record holder Wayde van Niekerk failed to recover from a knee injury in time for the Championships.
In the womens 400m, Emily Diamond and Britons Laviai Nielsen missed out to a place in Thursday. Olympic champion Miller-Uibo will be the favorite that was exceptional and eased into the closing.
Both Western bronze medallist Meghan Beesley and Jessica Turner qualified for Wednesdays 400m hurdles semi-finals. The pair finished third in their respective heats.
I have had two years now, Im feeling powerful now, Beesley told BBC Sport. I trust I can go out there tomorrow and measure it up a bit.
USA pair Dalilah Muhammad along with Sydney McLaughlin also improved. Olympic winner Muhammad, 29, is the hot favourite having put a new world record - 52.20 seconds - at the national trials.
In the mens 3,000 m steeplechase heats, Britains only representative, Zak Seddon, finished seventh in his heat and missed out to a spot in Fridays final.
The United States surged ahead following three gold medals on day five at the trophy table, such as Noah Lyles victory in the mens 200m.
Further success came in the mens pole vault prodigy Armand Duplantis and final, that proved to be a titanic tussle involving defending champion Sam Kendricks that was American.
It appeared that the 19-year-old European winner had it sewn up when he cleared 5.97m together with his third effort, prior to the American matched his accomplishment to a roar inside the Khalifa International Stadium.
Duplantis failed to clear 6.02m, which handed Kendricks the victory count-back. Bronze moved to Polands Piotr Lisek.
From the mens 800m final, Donavan Braziers bold tactics paid off because he comfortably won in 1 minute 42.34 seconds - a new championship and USA record.
The 22-year-old, next in the world ranking behind the Nijel Amos of Botswana, started his bid to get dwelling from 300m out and kept his form to win his first title.
Bosnian Amel Tuka promised silver and the Ferguson Rotich of Kenya was still third.
Among the moments of the championships came in the heats for the 400m hurdles when Qatars Mariam Mamdouh Farid completed last in one minute 9.49 minutes - almost 12secs supporting another put athlete, but at a personal best time.
Just one of just two female athletes in Qatar participate in the World Athletics Championships for the first time, Even the 21-year-old, explained her participation at the occasion was significant.
My goal is inspiring the younger generation, breaking down barriers, making peoples perception of the two girls are at the Middle East, said Farid, who had been competing at a dark full bodysuit under a federal group singlet.
We are not oppressed. My head and I will still compete on. When there is something I want to do, then Ill do it
Find out ways to enter sports with our distinctive guide.
British sprinter Adam Gemili believes helet so many individuals down after missing out on a medal at the mens 200m final in the World Athletics Championships.
Noah Lyles caps a marvellous season with success in the world 200m closing in 19.83 moments but Briton Adam Gemili narrowly misses out on a medal.
As she effortlessly qualifies for Wednesdays final britains Dina Asher-Smith underlines her status as favourite for the 200m domain.
Panorama journalist Mark Daly recounts how he started looking into Alberto Salazar and takes us through every step of this six-year investigation.
As Britains Adam Gemili misses out on a trophy in Doha, noah Lyles chooses the mens 200m gold for USA.
Ethiopias Takele Nigate endures a steeplechase to overlook by crashing headlong into the water leap throughout the 2019 World Athletics Championships, later following up.
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