Heats

All times shown are in seconds.

Q denotes automatic qualification.

q denotes fastest losers.

DNS denotes did not start.

DNF denotes did not finish.

NR denotes national record.

PB denotes personal best.

SB denotes seasons best.

In the initial six heats the first three from each plus the six fastest losers progressed through to the three semi-finals. Here the first two from each went to the final along with the two fastest losers.

Round 1

Qualification: First 3 in each heat (Q) and the next 6 fastest (q) advance to the Semifinals.

Rank	Heat	Athlete	Country	Time	Notes
1	6	Sanya Richards Sanya Richards Sanya Richards-Ross is a track and field athlete who competes internationally for the United States. She won an Olympic gold medal in the 4×400 meters relay at the 2008 Olympic Games in Beijing, China, an individual bronze medal at the 2008 Olympics for the 400 m, and a gold medal in the 2009...		50.11	Q
2	6	Christine Amertil Christine Amertil Christine Amertil is a Bahamian athlete competing mainly in the 400 metres. She graduated from Southeastern Louisiana University.- Achievements :*2006 IAAF World Indoor Championships - bronze medal...		50.23	Q, PB
3	6	Christine Ohurougu		50.50	Q, PB
4	4	Natalya Antyukh Natalya Antyukh Natalya Nikolayevna Antyukh is a Russian athlete who primarily competed in the 400 metres and 400 metre hurdles.In addition to winning medals in individual contests, she has been a very successful relay runner, winning a silver medal at the 2004 Olympics....		50.54	Q
5	4	DeeDee Trotter DeeDee Trotter De'Hashia Tonnek Trotter is an American athlete.She currently lives in Orlando, Florida, and trains at the University of Central Florida under Head Coach and former University Of Tennessee college coach Caryl Smith Gilbert.In 2007 she won the American championship in the 400m in a personal best...		50.56	Q
6	4	Novlene Williams Novlene Williams Novlene Hilaire Williams-Mills is a track and field athlete, competing internationally for Jamaica. She was initially a bronze medalist in the 4 x 400 m relay at the 2004 Olympic Games in Athens, Greece...		50.59	Q, PB
7	3	Natalya Nazarova Natalya Nazarova Natalya Viktorovna Nazarova is a sprint athlete.She was born in Moscow.Following a personal best time of 49.65 seconds run a fortnight earlier, Natalya had lost form by the start of the 2004 Summer Olympics in Athens, Greece, and only just made the final finishing 8th...		50.82	Q
8	1	Ana Guevara Ana Guevara Ana Gabriela Guevara Espinoza is a now-retired Mexican track and field athlete, specialized in the 400 meters. Her career began in 1996 carrying out diverse tours, participating in her first international competences...		50.93	Q
9	2	Monique Hennagan Monique Hennagan Monique Hennagan is an American athlete, who mainly competes in the 400 meters. She won her first relay medal at the 1999 World Indoor Championships and her second in 2003....		51.02	Q
10	6	Tiandra Ponteen Tiandra Ponteen Tiandra Ponteen is a Saint Kitts and Nevis sprinter who specializes in the 200 metres and the 400 metres.She won the 400 metres silver medal at the 2005 Central American and Caribbean Championships...		51.17	q
11	1	Lee McConnell Lee McConnell Lee McConnell is a Scottish athlete, who competes in the 400 metres. She attended Holyrood R.C. Secondary School in Glasgow before graduating from Loughborough University in 2000 with a degree in Sports Science. She became the Scottish 200 metres champion in 2002, and 2005. She also won the 400...		51.19	Q
11	3	Donna Fraser Donna Fraser Donna Karen Fraser in Thornton Heath, Croydon is an English athlete who mainly competed in the 200 and 400 metres.-Career:...		51.19	Q
13	5	Tonique Williams-Darling Tonique Williams-Darling Tonique Williams-Darling is a Bahamian sprint athlete. She won the gold medal in the 400 meters at the 2004 Summer Olympics in Athens, Greece.-College:...		51.20	Q
14	1	Grażyna Prokopek Grazyna Prokopek Grażyna Prokopek is a Polish sprinter who specializes in the 400 metres and 4x400 m relay.-Achievements:-Personal bests:*100 metres - 11.67 s *200 metres - 23.22 s *400 metres - 51.29 s -External links:...		51.29	Q, PB
14	2	Mariyana Dimitrova Mariyana Dimitrova Mariyana Dimitrova is a Bulgarian sprint athlete who specializes in the 400 metres.She finished sixth in the 400 m final at the 2006 IAAF World Indoor Championships in Moscow, and fourth at the 2006 European Athletics Championships in Gothenburg, the latter in a personal best time of 50.64 seconds...		51.29	Q
16	4	Aliann Pompey Aliann Pompey Aliann Pompey is a Guyanese sprinter who specializes in the 400 meters.Aliann graduated from Cohoes High School and received her bachelor's degree from Manhattan College in 1999....		51.33	q
17	5	Svetlana Usovich		51.37	Q
18	2	Kaltouma Nadjina Kaltouma Nadjina Kaltouma Nadjina is a Chadian sprinter. Her specialities are the 200 and 400 metres.Born in Bol by a modest family, her sportif career began when she participated in 1993 at Moundou to the National Sport Week...		51.50	Q
19	5	Antonina Yefremova Antonina Yefremova Antonina Yefremova is a Ukrainian sprinter who specializes in the 400 metres.She won the gold medal at the 2001 European U23 Championships, finished sixth at the 2002 European Championships and fourth at the 2008 World Indoor Championships...		51.53	Q
20	3	Hazel-Ann Regis Hazel-Ann Regis Hazel-Ann Regis is a Grenadian sprinter who specializes in the 400 metres.She participated at the World Championships in Athletics in 1999, 2003 and 2005 as well as the Summer Olympics in 2000 and 2004, without reaching the final....		51.66	Q
21	1	Fatou Bintou Fall Fatou Bintou Fall Fatou Bintou Fall is a female track and field athlete from Senegal, who mainly competes in the 400 metres. She set her personal best at the 2004 African Championships, claiming the gold medal: 50.62 seconds.- Achievements :...		51.87	q
22	3	Estie Wittstock		51.89	q
23	5	Mireille Nguimgo Mireille Nguimgo Mireille Nguimgo is a Cameroonian sprinter who specialized in the 400 metres.She has not competed on top level since the 2004 season.-Achievements:-Personal bests:*200 metres - 23.64 s...		51.90	q
24	4	Egle Uljas		51.91	q, NR
25	2	Nadia Davy Nadia Davy Nadia Davy is a track and field athlete, competing internationally for Jamaica. She was a bronze medalist in the 4x400m relay at the 2004 Olympic Games in Athens, Greece.-References:...		52.04
26	2	Maria Laura Almirao		52.10
27	1	Hortense Bewouda Hortense Béwouda Hortense Béwouda is a Cameroonian sprinter who specialized in the 400 metres.Her personal best time is 51.04 seconds, achieved in June 2004 in Algiers...		52.11
28	6	Geisa Aparecida Coutinho		52.18
29	3	Amy Mbacke Thiam Amy Mbacke Thiam Amy Mbacke Thiam is a Senegalese athlete competing in the 400 metres. She has won medals in two World Championships, but at the 2004 Olympics she was knocked out in the heats...		52.44
30	2	Kirsi Mykkanen		52.53
31	5	Allison Beckford Allison Beckford Allison J. Beckford Allison J. Beckford Allison J. Beckford (born May 8, 1979 in Westmorland is a Jamaican. She attended Manning's High school in Savanna-La-Mar, Westmoreland Jamaica. Where she was one of the star athletes coached by Howard Daugharty. She was also academically astute passing...		52.85
32	5	Sandrine Thiebaud-Kangni		52.87
33	1	Oksana Luneva Oksana Luneva Oksana Luneva is a Kyrgyz sprinter who specialized in the 400 metres.She competed at the Olympic Games in 2000 and 2004, but without reaching the final.Her personal best time was 52.14 seconds, achieved in July 2004 in Bishkek....		52.94
34	4	Svetlana Bodritskaya Svetlana Bodritskaya Svetlana Aleksandrovna Bodritskaya is a retired female sprinter Kazakhstan, who specialized in the 400 metres. Her personal best time is 51.78 seconds, achieved in June 2004 in Almaty.-Achievements:-References:*...		53.35
35	6	Makelesi Bulikiobo Makelesi Bulikiobo Makelesi Bulikiobo Batimala is a Fiji Islands sprinter.- Biography :Nicknamed the "Sprint Queen" by the Fiji Times and Fiji Village, she has represented her country in several international competitions, including the 2004 Summer Olympics in Athens. She won four gold medals at the 2003 South...		53.58
36	3	Amantle Montsho Amantle Montsho Amantle Montsho is a female sprinter from Botswana who specializes in the 400 metres. She represented her country at the 2004 and 2008 Summer Olympics, reaching the final at the latter edition...		53.77	NR
37	3	Zamira Amirova Zamira Amirova Zamira Amirova is an Uzbekistani middle distance runner who specializes in the 800 metres. Her personal best time is 2:02.30 minutes, achieved in June 2002 in Tashkent.-Achievements:-References:...		54.43
38	5	K V Damayanthi Dharsha		54.58
39	2	Fanfang Bo		56.01
40	4	Shifana Ali		1:00.92	NR
41	6	Salamtou Hassane Salamtou Hassane Salamtou Hassane is a Nigerien sprinter who specializes in the 400 metres.Hassane competed for Niger at the 2004 Summer Olympics in the Women's 400 metres, but was knocked out in the heats.-References:...		1:03.28	NR
42	1	Ruwida El Hubti		1:03.57	NR

Semifinal 1

Rank	Athlete	Country	Time	Notes
1	Ana Guevara Ana Guevara Ana Gabriela Guevara Espinoza is a now-retired Mexican track and field athlete, specialized in the 400 meters. Her career began in 1996 carrying out diverse tours, participating in her first international competences...		50.15	Q
2	Christine Amertil Christine Amertil Christine Amertil is a Bahamian athlete competing mainly in the 400 metres. She graduated from Southeastern Louisiana University.- Achievements :*2006 IAAF World Indoor Championships - bronze medal...		50.17	Q, PB
3	Sanya Richards Sanya Richards Sanya Richards-Ross is a track and field athlete who competes internationally for the United States. She won an Olympic gold medal in the 4×400 meters relay at the 2008 Olympic Games in Beijing, China, an individual bronze medal at the 2008 Olympics for the 400 m, and a gold medal in the 2009...		50.54	q
4	Christine Ohurougu		51.00
5	Tiandra Ponteen Tiandra Ponteen Tiandra Ponteen is a Saint Kitts and Nevis sprinter who specializes in the 200 metres and the 400 metres.She won the 400 metres silver medal at the 2005 Central American and Caribbean Championships...		51.33
6	Svetlana Usovich		51.42
7	Hazel-Ann Regis Hazel-Ann Regis Hazel-Ann Regis is a Grenadian sprinter who specializes in the 400 metres.She participated at the World Championships in Athletics in 1999, 2003 and 2005 as well as the Summer Olympics in 2000 and 2004, without reaching the final....		51.47
8	Egle Uljas		53.13

Richards was fastest away but was caught by Guevara at the 300 m. mark who was then joined by Amertil who improved her personal best for the second time in two days. Guevara eased comfortably through the last fifty, just doing enough to ensure Amertil didn't cross the line first. Richards held on to third from Ohurougu who could not reproduce her personal best of round one and cost herself a fastest losers place in the final by easing off considerably with 20 metres to go.

Semifinal 2

Rank	Athlete	Country	Time	Notes
1	Tonique Williams-Darling Tonique Williams-Darling Tonique Williams-Darling is a Bahamian sprint athlete. She won the gold medal in the 400 meters at the 2004 Summer Olympics in Athens, Greece.-College:...		50.00	Q
2	DeeDee Trotter DeeDee Trotter De'Hashia Tonnek Trotter is an American athlete.She currently lives in Orlando, Florida, and trains at the University of Central Florida under Head Coach and former University Of Tennessee college coach Caryl Smith Gilbert.In 2007 she won the American championship in the 400m in a personal best...		50.14	Q, PB
3	Natalya Nazarova Natalya Nazarova Natalya Viktorovna Nazarova is a sprint athlete.She was born in Moscow.Following a personal best time of 49.65 seconds run a fortnight earlier, Natalya had lost form by the start of the 2004 Summer Olympics in Athens, Greece, and only just made the final finishing 8th...		50.63	q
4	Fatou Bintou Fall Fatou Bintou Fall Fatou Bintou Fall is a female track and field athlete from Senegal, who mainly competes in the 400 metres. She set her personal best at the 2004 African Championships, claiming the gold medal: 50.62 seconds.- Achievements :...		51.21
5	Kaltouma Nadjina Kaltouma Nadjina Kaltouma Nadjina is a Chadian sprinter. Her specialities are the 200 and 400 metres.Born in Bol by a modest family, her sportif career began when she participated in 1993 at Moundou to the National Sport Week...		51.57
6	Estie Wittstock		51.77
7	Donna Fraser Donna Fraser Donna Karen Fraser in Thornton Heath, Croydon is an English athlete who mainly competed in the 200 and 400 metres.-Career:...		51.94
8	Grażyna Prokopek Grazyna Prokopek Grażyna Prokopek is a Polish sprinter who specializes in the 400 metres and 4x400 m relay.-Achievements:-Personal bests:*100 metres - 11.67 s *200 metres - 23.22 s *400 metres - 51.29 s -External links:...		51.96

The Bahamian, Williams-Darling, was always in control and easily kept in front of the below par Nazarova who was fighting hard to run her down. The Russian claimed a fastest losers place as she was overtaken in the home straight by a fast finishing DeeDee Trotter.

Semifinal 3

Rank	Athlete	Country	Time	Notes
1	Monique Hennagan Monique Hennagan Monique Hennagan is an American athlete, who mainly competes in the 400 meters. She won her first relay medal at the 1999 World Indoor Championships and her second in 2003....		49.88	Q
2	Natalya Antyukh Natalya Antyukh Natalya Nikolayevna Antyukh is a Russian athlete who primarily competed in the 400 metres and 400 metre hurdles.In addition to winning medals in individual contests, she has been a very successful relay runner, winning a silver medal at the 2004 Olympics....		50.04	Q
3	Novlene Williams Novlene Williams Novlene Hilaire Williams-Mills is a track and field athlete, competing internationally for Jamaica. She was initially a bronze medalist in the 4 x 400 m relay at the 2004 Olympic Games in Athens, Greece...		50.85
4	Mariyana Dimitrova Mariyana Dimitrova Mariyana Dimitrova is a Bulgarian sprint athlete who specializes in the 400 metres.She finished sixth in the 400 m final at the 2006 IAAF World Indoor Championships in Moscow, and fourth at the 2006 European Athletics Championships in Gothenburg, the latter in a personal best time of 50.64 seconds...		51.20	PB
5	Aliann Pompey Aliann Pompey Aliann Pompey is a Guyanese sprinter who specializes in the 400 meters.Aliann graduated from Cohoes High School and received her bachelor's degree from Manhattan College in 1999....		51.61
6	Antonina Yefremova Antonina Yefremova Antonina Yefremova is a Ukrainian sprinter who specializes in the 400 metres.She won the gold medal at the 2001 European U23 Championships, finished sixth at the 2002 European Championships and fourth at the 2008 World Indoor Championships...		51.90
7	Mireille Nguimgo Mireille Nguimgo Mireille Nguimgo is a Cameroonian sprinter who specialized in the 400 metres.She has not competed on top level since the 2004 season.-Achievements:-Personal bests:*200 metres - 23.64 s...		52.21
8	Lee McConnell Lee McConnell Lee McConnell is a Scottish athlete, who competes in the 400 metres. She attended Holyrood R.C. Secondary School in Glasgow before graduating from Loughborough University in 2000 with a degree in Sports Science. She became the Scottish 200 metres champion in 2002, and 2005. She also won the 400...		52.63

The easiest of the semis for Hennagan and Antyukh who were in a different class from the rest though the Jamaican, Williams, might have got closer to them if she had not left all her running until the last hundred metres.

Semifinals summary

Rank	Heat	Athlete	Country	Time	Notes
1	3	Monique Hennagan Monique Hennagan Monique Hennagan is an American athlete, who mainly competes in the 400 meters. She won her first relay medal at the 1999 World Indoor Championships and her second in 2003....		49.88	Q
2	2	Tonique Williams-Darling Tonique Williams-Darling Tonique Williams-Darling is a Bahamian sprint athlete. She won the gold medal in the 400 meters at the 2004 Summer Olympics in Athens, Greece.-College:...		50.00	Q
3	3	Natalya Antyukh Natalya Antyukh Natalya Nikolayevna Antyukh is a Russian athlete who primarily competed in the 400 metres and 400 metre hurdles.In addition to winning medals in individual contests, she has been a very successful relay runner, winning a silver medal at the 2004 Olympics....		50.04	Q
4	2	DeeDee Trotter DeeDee Trotter De'Hashia Tonnek Trotter is an American athlete.She currently lives in Orlando, Florida, and trains at the University of Central Florida under Head Coach and former University Of Tennessee college coach Caryl Smith Gilbert.In 2007 she won the American championship in the 400m in a personal best...		50.14	Q, PB
5	1	Ana Guevara Ana Guevara Ana Gabriela Guevara Espinoza is a now-retired Mexican track and field athlete, specialized in the 400 meters. Her career began in 1996 carrying out diverse tours, participating in her first international competences...		50.15	Q
6	1	Christine Amertil Christine Amertil Christine Amertil is a Bahamian athlete competing mainly in the 400 metres. She graduated from Southeastern Louisiana University.- Achievements :*2006 IAAF World Indoor Championships - bronze medal...		50.17	Q, PB
7	1	Sanya Richards Sanya Richards Sanya Richards-Ross is a track and field athlete who competes internationally for the United States. She won an Olympic gold medal in the 4×400 meters relay at the 2008 Olympic Games in Beijing, China, an individual bronze medal at the 2008 Olympics for the 400 m, and a gold medal in the 2009...		50.54	q
8	2	Natalya Nazarova Natalya Nazarova Natalya Viktorovna Nazarova is a sprint athlete.She was born in Moscow.Following a personal best time of 49.65 seconds run a fortnight earlier, Natalya had lost form by the start of the 2004 Summer Olympics in Athens, Greece, and only just made the final finishing 8th...		50.63	q
9	3	Novlene Williams Novlene Williams Novlene Hilaire Williams-Mills is a track and field athlete, competing internationally for Jamaica. She was initially a bronze medalist in the 4 x 400 m relay at the 2004 Olympic Games in Athens, Greece...		50.85
10	1	Christine Ohurougu		51.00
11	3	Mariyana Dimitrova Mariyana Dimitrova Mariyana Dimitrova is a Bulgarian sprint athlete who specializes in the 400 metres.She finished sixth in the 400 m final at the 2006 IAAF World Indoor Championships in Moscow, and fourth at the 2006 European Athletics Championships in Gothenburg, the latter in a personal best time of 50.64 seconds...		51.20	PB
12	2	Fatou Bintou Fall Fatou Bintou Fall Fatou Bintou Fall is a female track and field athlete from Senegal, who mainly competes in the 400 metres. She set her personal best at the 2004 African Championships, claiming the gold medal: 50.62 seconds.- Achievements :...		51.21
13	1	Tiandra Ponteen Tiandra Ponteen Tiandra Ponteen is a Saint Kitts and Nevis sprinter who specializes in the 200 metres and the 400 metres.She won the 400 metres silver medal at the 2005 Central American and Caribbean Championships...		51.33
14	1	Svetlana Usovich		51.42
15	1	Hazel-Ann Regis Hazel-Ann Regis Hazel-Ann Regis is a Grenadian sprinter who specializes in the 400 metres.She participated at the World Championships in Athletics in 1999, 2003 and 2005 as well as the Summer Olympics in 2000 and 2004, without reaching the final....		51.47
16	2	Kaltouma Nadjina Kaltouma Nadjina Kaltouma Nadjina is a Chadian sprinter. Her specialities are the 200 and 400 metres.Born in Bol by a modest family, her sportif career began when she participated in 1993 at Moundou to the National Sport Week...		51.57
17	3	Aliann Pompey Aliann Pompey Aliann Pompey is a Guyanese sprinter who specializes in the 400 meters.Aliann graduated from Cohoes High School and received her bachelor's degree from Manhattan College in 1999....		51.61
18	2	Estie Wittstock		51.77
19	3	Antonina Yefremova Antonina Yefremova Antonina Yefremova is a Ukrainian sprinter who specializes in the 400 metres.She won the gold medal at the 2001 European U23 Championships, finished sixth at the 2002 European Championships and fourth at the 2008 World Indoor Championships...		51.90
20	2	Donna Fraser Donna Fraser Donna Karen Fraser in Thornton Heath, Croydon is an English athlete who mainly competed in the 200 and 400 metres.-Career:...		51.94
21	2	Grażyna Prokopek Grazyna Prokopek Grażyna Prokopek is a Polish sprinter who specializes in the 400 metres and 4x400 m relay.-Achievements:-Personal bests:*100 metres - 11.67 s *200 metres - 23.22 s *400 metres - 51.29 s -External links:...		51.96
22	3	Mireille Nguimgo Mireille Nguimgo Mireille Nguimgo is a Cameroonian sprinter who specialized in the 400 metres.She has not competed on top level since the 2004 season.-Achievements:-Personal bests:*200 metres - 23.64 s...		52.21
23	3	Lee McConnell Lee McConnell Lee McConnell is a Scottish athlete, who competes in the 400 metres. She attended Holyrood R.C. Secondary School in Glasgow before graduating from Loughborough University in 2000 with a degree in Sports Science. She became the Scottish 200 metres champion in 2002, and 2005. She also won the 400...		52.63
24	1	Egle Uljas		53.13

Final

Rank	Athlete	Country	Time	Notes
	Tonique Williams-Darling Tonique Williams-Darling Tonique Williams-Darling is a Bahamian sprint athlete. She won the gold medal in the 400 meters at the 2004 Summer Olympics in Athens, Greece.-College:...		49.42
	Ana Guevara Ana Guevara Ana Gabriela Guevara Espinoza is a now-retired Mexican track and field athlete, specialized in the 400 meters. Her career began in 1996 carrying out diverse tours, participating in her first international competences...		49.56	SB
	Natalya Antyukh Natalya Antyukh Natalya Nikolayevna Antyukh is a Russian athlete who primarily competed in the 400 metres and 400 metre hurdles.In addition to winning medals in individual contests, she has been a very successful relay runner, winning a silver medal at the 2004 Olympics....		49.89
4	Monique Hennagan Monique Hennagan Monique Hennagan is an American athlete, who mainly competes in the 400 meters. She won her first relay medal at the 1999 World Indoor Championships and her second in 2003....		49.97
5	DeeDee Trotter DeeDee Trotter De'Hashia Tonnek Trotter is an American athlete.She currently lives in Orlando, Florida, and trains at the University of Central Florida under Head Coach and former University Of Tennessee college coach Caryl Smith Gilbert.In 2007 she won the American championship in the 400m in a personal best...		50.00	PB
6	Sanya Richards Sanya Richards Sanya Richards-Ross is a track and field athlete who competes internationally for the United States. She won an Olympic gold medal in the 4×400 meters relay at the 2008 Olympic Games in Beijing, China, an individual bronze medal at the 2008 Olympics for the 400 m, and a gold medal in the 2009...		50.19
7	Christine Amertil Christine Amertil Christine Amertil is a Bahamian athlete competing mainly in the 400 metres. She graduated from Southeastern Louisiana University.- Achievements :*2006 IAAF World Indoor Championships - bronze medal...		50.37
8	Natalya Nazarova Natalya Nazarova Natalya Viktorovna Nazarova is a sprint athlete.She was born in Moscow.Following a personal best time of 49.65 seconds run a fortnight earlier, Natalya had lost form by the start of the 2004 Summer Olympics in Athens, Greece, and only just made the final finishing 8th...		50.65