The women's 400 metres at the 2015 World Championships in Athletics was held at the Beijing National Stadium on 24, 25 and 27 August. Christine Ohuruogu of Great Britain entered the competition as the defending champion.Ennis-Hill named in British team for IAAF World Championships, Beijing 2015. IAAF (2015-07-28). Retrieved on 2015-08-16.

Summary Allyson Felix was known as a 200 metres specialist, but two years earlier, her string of 200 meter championships was broken when she sustained a hamstring injury in the final. Based on winning the 2014 Diamond League, Felix was qualified to enter the 200 metres at the World Championships but chose to forgo that opportunity to focus on the 400 metres. This was her bid to win the one title she didn't have under her belt; in the same event at the 2011 World Championships, she narrowly lost to Amantle Montsho of Botswana. With world leader Francena McCorory unable to qualify at the American Championships, Felix was the favorite. Defending champion Christine Ohuruogu, known for her late rush, also made the final.

With high expectations, Felix took off strongly running her first 200 metres. She kept building on her lead, coming off the final turn several steps ahead of Shericka Jackson the next out of the turn. While Felix didn't further advance her lead, she kept her margin on Jackson for a clear win. Shaunae Miller made a powerful rush to the finish, passing Jackson for the silver and gaining on Felix down the home stretch. Jackson beat three other Jamaican teammates for the bronze.

Records Prior to the competition, the records were as follows:

World record47.60Canberra, Australia6 October 1985Championship record47.99Helsinki, Finland10 August 1983World leading49.83Fontvieille, Monaco17 July 2015African record49.10Atlanta, United States29 July 1996Asian record49.81Beijing, China11 September 1993NACAC record48.70Athens, Greece16 September 2006South American record49.64Barcelona, Spain5 August 1992European record47.60Canberra, Australia6 October 1985Oceanian record48.63Atlanta, United States29 July 1996The following records were established during the competition:World leading49.26Beijing, China27 August 2015

Qualification standards Entry standards 52.00

Schedule Date Time Round24 August 2015 10:45 Heats25 August 2015 19:05 Semifinals27 August 2015 20:40 Final

Results KEY:QQualifiedqFastest non-qualifiersNRNational recordPBPersonal bestSBSeasonal best

Heats Qualification: First 3 in each heat (Q) and the next 6 fastest (q) advanced to the semifinals.Heats results

Rank Heat Name Nationality Time Notes 1 4 Stephenie Ann McPherson 50.34 , 2 5 Bianca Răzor 50.37 , 3 5 Shericka Jackson 50.41 4 4 Phyllis Francis 50.52 , 5 6 Shaunae Miller 50.53 6 3 Christine Day 50.58 7 1 Allyson Felix 50.60 8 3 Joy Sakari 50.71 , 9 5 Patience Okon George 50.87 10 1 Floria Gueï 50.89 , 11 2 Christine Ohuruogu 51.01 12 6 Novlene Williams-Mills 51.07 , 12 1 Nataliya Pyhyda 51.07 , 14 5 Anyika Onuora 51.14 , 15 2 Marie Gayot 51.24 , 16 2 Natasha Hastings 51.25 17 1 Patrycja Wyciszkiewicz 51.31 , 18 2 Maureen Jelagat Maiyo 51.40 , 19 4 Nadezhda Kotlyarova 51.42 , 20 6 Ekaterina Renzhina 51.55 20 3 Kabange Mupopo 51.55 22 6 Libania Grenot 51.64 23 1 Anneliese Rubie 51.69 , 24 5 Carline Muir 51.70 , 25 4 Regina George 51.74 25 4 Małgorzata Hołub 51.74 27 6 Olha Zemlyak 52.00 28 6 Iga Baumgart 52.02 29 3 Mariya Mikhailyuk 52.16 30 3 Gunta Latiševa-Čudare 52.17 31 1 Kineke Alexander 52.24 32 5 Lisneidy Veitia 52.25 33 2 Tosin Adeloye 52.42 34 4 Justine Palframan 52.45 35 3 Maria Benedicta Chigbolu 52.48 36 1 Iveta Putalová 52.52 37 2 Geisa Coutinho 52.72 38 6 Aauri Bokesa 52.98 39 3 Audrey Jean-Baptiste 53.18 40 2 Amaliya Sharoyan 54.16 41 4 Dil Maya Karki 5 Jacinter Shikanda

Semifinals Qualification: First 2 in each heat (Q) and the next 2 fastest (q) advanced to the final.

Rank Heat Name Nationality Time Notes 1 3 Allyson Felix 49.89 , 2 3 Shericka Jackson 50.03 , 3 1 Shaunae Miller 50.12 4 2 Christine Ohuruogu 50.16 , 5 2 Stephenie Ann McPherson 50.32 , 6 3 Novlene Williams-Mills 50.47 , 7 2 Phyllis Francis 50.50 , 8 3 Nataliya Pyhyda 50.62 9 2 Patience Okon George 50.76 10 1 Christine Day 50.82 11 3 Anyika Onuora 50.87 12 2 Marie Gayot 50.97 13 3 Bianca Răzor 51.05 14 1 Libania Grenot 51.14 15 1 Floria Gueï 51.30 16 1 Natasha Hastings 51.33 17 2 Ekaterina Renzhina 51.49 18 1 Nadezhda Kotlyarova 51.86 19 3 Maureen Jelagat Maiyo 51.92 20 3 Kabange Mupopo 51.93 21 2 Patrycja Wyciszkiewicz 51.94 22 1 Anneliese Rubie 52.04 23 2 Carline Muir 52.31 1 Joy Sakari

Final The final was held at 20:40.Final results

Rank Lane Name Nationality Time Notes 6 Allyson Felix 49.26 5 Shaunae Miller 49.67 4 Shericka Jackson 49.99 4 8 Christine Day 50.14 5 9 Stephenie Ann McPherson 50.42 6 2 Novlene Williams-Mills 50.47 7 3 Phyllis Francis 50.51 8 7 Christine Ohuruogu 50.63

References