Athletics at the 2012 Summer Olympics – Women's 400 metres hurdles
| Women's 400 metres hurdles at the Games of the XXX Olympiad
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| Venue | Olympic Stadium | ||||||||||||
| Date | 5–8 August | ||||||||||||
| Competitors | 43 from 35 nations | ||||||||||||
| Winning time | 52.70 | ||||||||||||
| Medalists | |||||||||||||
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Natalya Antyukh |
 Russia
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Lashinda Demus |
 United States
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Zuzana Hejnová |
 Czech Republic
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The women's 400 metres hurdles competition at the 2012 Summer Olympics in London, United Kingdom was held at the Olympic Stadium on 5–8 August.
The opening round went largely to form, except 2012 world #7 Vania Stambolova took herself out crashing the first hurdle. Vera Barbosa set the national record for Portugal in advancing.
The first semi final loaded up Natalya Antyukh and Zuzana Hejnová who pushed each other to the finish and the top two qualifying times, plus taking T'erea Brown to the top time qualifier. In the second semi Lashinda Demus had a clear lead, slowing on the way home to just exert enough effort to finish first. The final semi was the slowest led by Muizat Ajoke Odumosu's Nigerian national record, Georganne Moline and Denisa Rosolova battled for second, with Rosolova taking the other time qualifier in the process.
In the final, Demus was first over the first two hurdles, then Antyukh steadily built her lead to a full stride at hurdle 9, with Demus the closest challenger. Antyukh stuttered the tenth hurdle, opening the door for Demus to chase her to the finish line, but Antyukh held on for gold, Demus disappointed with silver and Hejnová clearly in the bronze medal position.
Antyukh's time brought her to the number 6 athlete of all time, defeating Demus who already held number 3.
The women's 400 m hurdles competition consisted of heats (Round 1), semifinals and a final. The fastest competitors from each race in the heats qualified for the semifinals along with the fastest overall competitors not already qualified that were required to fill the available spaces in the semifinals. 24 competitors qualified from the heats for the semifinals. A total of eight competitors qualified for the final from the semifinals.
Prior to the competition[update], the existing World and Olympic records were as follows.
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