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By Saj Chowdhury
BBC Sport at Doha
The hopes of a third 2019 World Championships medal of dina Asher-Smith remained intact as Britains 4x100m relay teams qualified for Saturdays finals.
Britains men, the defending champions, made it during their heat with a 2019 world direct time of 37.56 minutes.
Jake Wightman, Josh Kerr and britons Neil Gourley appeared in good shape since they reached Sundays 1500m final.
USAs Dalilah Muhammad establish a world record for the second time since she won the womens 400m hurdles final.
After sitting out Fridays heat asher-Smith, silver medallist and the 200m champion, will be attracted to the quartet for the closing.
She relied on Asha Philip, Imani-Lara Lansiquot, Ashleigh Nelson along with Daryll Neita and they maintained their composure to deliver the baton securely around in a years best time of 42.25 seconds.
With a mistake, Nelson was included In the World Relays earlier in the year, but her trade by Neita, on the anchor , was faultless.
Neita told BBC Sport:Weve practised so tough. Weve had an wonderful camp coming into this. I feel like we are moving away from the technical side and moving into the hope.
All of us trust each other. I am really proud people Saturday will be great.
Jamaicas quartet, which included 100m gold medallist Shelly-Ann Fraser-Pryce, won the heat in 42.11.
Defending champions USA won their heat to choose their place at the final.
The British mens team of Richard Kilty, Zharnel Hughes, Adam Gemili and Nethaneel Mitchell-Blake were also impressive as they won their race with distance between themselves and the Americans, that came and included 100m champion Christian Coleman.
Gemili, fourth in the mens 200m, told BBC Sport:Im actually good. I feel really fresh. Its always an honour. We were looking for redemption, especially myself and Zharnel, after what happened in the people.
Terrific Britain captain Kilty added:We knew the secret to this has been comfort. I said to the lads at the start – this is one seamless effort of carrying the baton around, and we have done that well We are filled with confidence, relaxed and ready to go again.
Mitchell-Blake said:Right now we have to rewrite the history books and focus at what is on hand right now.
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In the womens 400m hurdles, Muhammad held away compatriot Sydney McLaughlin in a thrilling final.
The 29-year-old won in 52.16 minutes – 0.04 quicker than the time she place in July.
McLaughlin, 20, made a dazzling late dash to clock 52.23, which is the third fastest .
Jamaicas Rushell Clayton took bronze in 53.74.
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