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By Saj Chowdhury
BBC Sport in Doha
Dina Asher-Smiths hopes of a third 2019 World Championships trophy stayed intact as equally Britains 4x100m relay teams qualified for Saturdays finals.
Britains men, the defending champions, made it during their heat using a 2019 world direct time of 37.56 minutes.
Josh Kerr britons Neil Gourley and Jake Wightman appeared in good shape as they reached Sundays 1500m final.
USAs Dalilah Muhammad set a world record for the second time this year as she won the womens 400m hurdles final.
Asher-Smith, the champion and silver medallist, will be attracted to the quartet for its closing after sitting out Fridays heat.
She depended upon Asha Philip, Imani-Lara Lansiquot, Ashleigh Nelson along with Daryll Neita and they maintained their composure to deliver the baton safely around in a seasons best time of 42.25 seconds.
At the World Relays earlier in the calendar year, Nelson was involved with a error, but her exchange by Neita, on the , was faultless.
Neita told BBC Sport:Weve practised so hard. We have had an remarkable camp coming to this. I feel as though were moving out from the side and moving into the hope.
All of us trust each other. Im really proud people Saturday will be great.
Jamaicas quartet, which comprised 100m gold medallist Shelly-Ann Fraser-Pryce, won the warmth in 42.11.
Defending champions USA won their heat to choose their place at the final.
The mens team of Richard Kilty, Zharnel Hughes, Adam Gemili and Nethaneel Mitchell-Blake were also impressive since they won their race with clear distance between themselves and the Americans, that came with Brazil and included 100m winner Christian Coleman.
Gemili, fourth in the mens 200m, told BBC Sport:Im actually good. I feel really refreshing. Its always an honor to come back out with those guys. We were looking for redemption, particularly myself and Zharnel, after what occurred in the people.
Terrific Britain captain Kilty included:We understood the secret to this has been relaxation. I explained to the lads at the beginning – that is one seamless attempt of taking the baton around, and we have done that well We are full of assurance, relaxed and ready to go again.
Mitchell-Blake explained:Right now we have to rewrite the history books and concentrate at whats available right now.
Find out how to get into athletics with our guide.
From the womens 400m hurdles, Muhammad hauled away compatriot Sydney McLaughlin at a thrilling final.
The 29-year-old won in 52.16 minutes – 0.04 quicker compared to the time she set in July.
McLaughlin, 20, produced a dazzling late dash to clock 52.23, which is the next fastest ever.
Jamaicas Rushell Clayton took bronze 53.74.
Behind the scenes with the largest police force of Britain
It cries to space and cross country running or sprints and has among the widest ranges of choice in sport, from leaps.
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