400 metres

Athletics
400 metres

The closing stages of a men's 400 m race
Men's records
World South Africa Wayde van Niekerk 43.03 (2016)
Olympic South Africa Wayde van Niekerk 43.03 (2016)
Women's records
World East Germany Marita Koch 47.60 (1985)
Olympic France Marie-José Pérec 48.25 (1996)

The 400 metres, or 400 metre dash, is a common sprinting event in track and field competitions. It has been featured in the athletics programme at the Summer Olympics since 1896 for men and since 1964 for women. On a standard outdoor running track, it is one lap around the track. Runners start in staggered positions and race in separate lanes for the entire course. In many countries, athletes previously competed in the 440 yard dash (402.336 m)—which is a quarter of a mile and was referred to as the 'quarter-mile'—instead of the 400 m (437.445 yards), though this distance is now obsolete. An athlete who competes in the 400 m may still be referred to as 'quarter-miler'; the distance or event might still be called the "quarter."

Maximum sprint speed capability is a significant contributing factor to success in the event, but athletes also require substantial speed endurance and the ability to cope well with high amounts of lactic acid to sustain a fast speed over a whole lap. While considered to be predominantly an anaerobic event, there is some aerobic involvement and the degree of aerobic training required for 400 metre athletes is open to debate.[1]

The current men's world record is held by Wayde van Niekerk, with a time of 43.03 seconds; van Niekerk is also the reigning world and Olympic champion. The world indoor record holder is Kerron Clement, in 44.57 seconds. The current women's world record is held by Marita Koch, with a time of 47.60 seconds. Allyson Felix is the reigning women's world champion, while Shaunae Miller holds the women's Olympic title. The men's T43 (classification) Paralympic world record of 45.07 seconds is held by Oscar Pistorius.[2]

An Olympic double of 200 metres and 400 m was first achieved by Valerie Brisco-Hooks in 1984, and later by Michael Johnson from the United States and Marie-José Pérec of France both in 1996. Alberto Juantorena of Cuba at the 1976 Summer Olympics became the first and so far the only athlete to win both the 400 m and 800 m Olympic titles.

The Olympic champion has frequently won a second gold medal in the 4 × 400 metres relay. This has been accomplished 14 times by men; Charles Reidpath, Ray Barbuti, Bill Carr, George Rhoden, Charles Jenkins, Otis Davis, Mike Larrabee, Lee Evans, Viktor Markin, Alonzo Babers, Steve Lewis, Quincy Watts, Jeremy Wariner and LaShawn Merritt; and 4 times by women; Monika Zehrt, Valerie Brisco-Hooks, Olga Bryzgina and Sanya Richards-Ross.

From 31 appearances in the Olympic Games, the men's gold medallist came from the USA 19 times.

Continental records

Area Men Women
Time (s) Athlete Nation Time (s) Athlete Nation
Africa (records) 43.03 WR Wayde van Niekerk  South Africa 49.10 Falilat Ogunkoya  Nigeria
Asia (records) 43.93 Yousef Ahmed Masrahi  Saudi Arabia 49.81 Ma Yuqin  China
Europe (records) 44.33 Thomas Schönlebe  East Germany 47.60 WR Marita Koch  East Germany
North, Central America
and Caribbean
(records)
43.18 Michael Johnson  United States 48.70 Sanya Richards  United States
Oceania (records) 44.38 Darren Clark  Australia 48.63 Cathy Freeman  Australia
South America (records) 44.29 Sanderlei Parrela  Brazil 49.64 Ximena Restrepo  Colombia

All-time top 25 men

Rank Time Athlete Nation Date Location Ref
1. 43.03 Wayde van Niekerk  South Africa 14 August 2016 Rio de Janeiro [3]
2. 43.18 Michael Johnson  United States 26 August 1999 Seville
3. 43.29 Harry 'Butch' Reynolds  United States 17 August 1988 Zürich
4. 43.45 Jeremy Wariner  United States 31 August 2007 Osaka
5. 43.50 Quincy Watts  United States 5 August 1992 Barcelona
6. 43.65 LaShawn Merritt  United States 26 August 2015 Beijing [4]
7. 43.72 Isaac Makwala  Botswana 5 July 2015 La Chaux-de-Fonds [5]
8. 43.74 Kirani James  Grenada 3 July 2014 Lausanne [6]
9. 43.81 Danny Everett  United States 26 June 1992 New Orleans
10. 43.86 A Lee Evans  United States 18 October 1968 Mexico City
11. 43.87 Steve Lewis  United States 28 September 1988 Seoul
12. 43.93 Yousef Ahmed Masrahi  Saudi Arabia 23 August 2015 Beijing [7]
Rusheen McDonald  Jamaica 23 August 2015 Beijing [8]
14. 43.97 A Larry James  United States 18 October 1968 Mexico City
15. 44.01 Machel Cedenio  Trinidad and Tobago 14 August 2016 Rio de Janeiro [9]
16. 44.05 Angelo Taylor  United States 23 June 2007 Indianapolis
17. 44.09 Alvin Harrison  United States 19 June 1996 Atlanta
Jerome Young  United States 21 June 1998 New Orleans
19. 44.10 Gary Kikaya  Democratic Republic of the Congo 9 September 2006 Stuttgart
20. 44.11 Luguelín Santos  Dominican Republic 26 August 2015 Beijing [10]
21. 44.13 Derek Mills  United States 4 June 1995 Eugene
22. 44.14 Roberto Hernandez  Cuba 30 May 1990 Seville
23. 44.15 Anthuan Maybank  United States 3 July 1996 Lausanne
24. 44.16 Otis Harris  United States 23 August 2004 Athens
25. 44.17 Innocent Egbunike  Nigeria 19 August 1987 Zurich

Notes

Below is a list of all other times equal or superior to 43.80.

A = time was set at altitude.

All-time top 25 Women

Rank Time Athlete Nation Date Location Ref
1. 47.60 Marita Koch  East Germany 6 October 1985 Canberra
2. 47.99 Jarmila Kratochvílová  Czechoslovakia 10 August 1983 Helsinki
3. 48.25 Marie-José Pérec  France 29 July 1996 Atlanta
4. 48.27 Olga Vladykina  Soviet Union 6 October 1985 Canberra
5. 48.59 Taťána Kocembová  Czechoslovakia 10 August 1983 Helsinki
6. 48.63 Cathy Freeman  Australia 29 July 1996 Atlanta
7. 48.70 Sanya Richards  United States 16 September 2006 Athens
8. 48.83 Valerie Brisco-Hooks  United States 6 August 1984 Los Angeles
9. 48.89 Ana Guevara  Mexico 27 August 2003 Paris Saint-Denis
10. 49.05 Chandra Cheeseborough  United States 6 August 1984 Los Angeles
11. 49.07 Tonique Williams-Darling  Bahamas 12 September 2004 Berlin
12. 49.10 Falilat Ogunkoya  Nigeria 29 July 1996 Atlanta
13. 49.11 Olga Nazarova  Soviet Union 25 September 1988 Seoul
14. 49.16 Antonina Krivoshapka  Russia 5 July 2012 Cheboksary
15. 49.19 Mariya Pinigina  Soviet Union 10 August 1983 Helsinki
16. 49.24 Sabine Busch  East Germany June 1984 Erfurt
17. 49.26 Allyson Felix  United States 27 August 2015 Beijing [11]
18. 49.28 Irena Szewinska  Poland 29 July 1976 Montreal
Pauline Davis  Bahamas 29 July 1996 Atlanta
Yuliya Gushchina  Russia 5 July 2012 Cheboksary
21. 49.29 Charity Opara  Nigeria 14 July 1998 Rome
22. 49.30 Petra Muller  East Germany 3 June 1988 Jena
Lorraine Fenton  Jamaica 19 July 2002 Monaco
24. 49.32 Shericka Williams  Jamaica 18 August 2009 Berlin
25. 49.33 Amantle Montsho  Botswana 19 July 2013 Monaco

Notes

Below is a list of all other times superior to 48.80.

Fastest relay splits

Men

Split Athlete Date Location
42.9  Michael Johnson (USA) 22 August 1993 Stuttgart
43.1  Quincy Watts (USA) 8 August 1992 Barcelona
 Jeremy Wariner (USA) 2 September 2007 Osaka
43.2  Ronald Freeman (USA) 20 October 1968 Mexico City
 Harry "Butch" Reynolds (USA) 22 August 1993 Stuttgart
 Tony McQuay (USA) 20 August 2016 Rio de Janeiro[12]
43.3  Demetrius Pinder (BAH) 10 August 2012 London

Women

Split Athlete Date Location
47.6  Jarmila Kratochvilova (CZE) 11 September 1982 Athens
47.7  Marita Koch (GDR) 3 June 1984 Erfurt
 Allyson Felix (USA) 30 August 2015 Beijing
47.8  Olga Bryzgina (URS) 1 October 1988 Seoul
 Olga Nazarova (URS)
48.0  Florence Griffith-Joyner (USA)

Most successful athletes

Multiple (3 or more) 400 metres victories at the Olympic Games and World Championships:

Olympic medalists

Men

Games Gold Silver Bronze
1896 Athens
 Thomas Burke (USA)  Herbert Jamison (USA)  Charles Gmelin (GBR)
1900 Paris
 Maxie Long (USA)  William Holland (USA)  Ernst Schultz (DEN)
1904 St. Louis
 Harry Hillman (USA)  Frank Waller (USA)  Herman Groman (USA)
1908 London
 Wyndham Halswelle (GBR) None awarded None awarded
1912 Stockholm
 Charles Reidpath (USA)  Hanns Braun (GER)  Edward Lindberg (USA)
1920 Antwerp
 Bevil Rudd (RSA)  Guy Butler (GBR)  Nils Engdahl (SWE)
1924 Paris
 Eric Liddell (GBR)  Horatio Fitch (USA)  Guy Butler (GBR)
1928 Amsterdam
 Ray Barbuti (USA)  James Ball (CAN)  Joachim Büchner (GER)
1932 Los Angeles
 Bill Carr (USA)  Ben Eastman (USA)  Alex Wilson (CAN)
1936 Berlin
 Archie Williams (USA)  Godfrey Brown (GBR)  James LuValle (USA)
1948 London
 Arthur Wint (JAM)  Herb McKenley (JAM)  Mal Whitfield (USA)
1952 Helsinki
 George Rhoden (JAM)  Herb McKenley (JAM)  Ollie Matson (USA)
1956 Melbourne
 Charles Jenkins (USA)  Karl-Friedrich Haas (EUA)  Voitto Hellstén (FIN)
 Ardalion Ignatyev (URS)
1960 Rome
 Otis Davis (USA)  Carl Kaufmann (EUA)  Malcolm Spence (RSA)
1964 Tokyo
 Mike Larrabee (USA)  Wendell Mottley (TRI)  Andrzej Badeński (POL)
1968 Mexico City
 Lee Evans (USA)  Larry James (USA)  Ron Freeman (USA)
1972 Munich
 Vincent Matthews (USA)  Wayne Collett (USA)  Julius Sang (KEN)
1976 Montreal
 Alberto Juantorena (CUB)  Fred Newhouse (USA)  Herman Frazier (USA)
1980 Moscow
 Viktor Markin (URS)  Rick Mitchell (AUS)  Frank Schaffer (GDR)
1984 Los Angeles
 Alonzo Babers (USA)  Gabriel Tiacoh (CIV)  Antonio McKay (USA)
1988 Seoul
 Steve Lewis (USA)  Butch Reynolds (USA)  Danny Everett (USA)
1992 Barcelona
 Quincy Watts (USA)  Steve Lewis (USA)  Samson Kitur (KEN)
1996 Atlanta
 Michael Johnson (USA)  Roger Black (GBR)  Davis Kamoga (UGA)
2000 Sydney
 Michael Johnson (USA)  Alvin Harrison (USA)  Greg Haughton (JAM)
2004 Athens
 Jeremy Wariner (USA)  Otis Harris (USA)  Derrick Brew (USA)
2008 Beijing
 LaShawn Merritt (USA)  Jeremy Wariner (USA)  David Neville (USA)
2012 London
 Kirani James (GRN)  Luguelín Santos (DOM)  Lalonde Gordon (TRI)
2016 Rio de Janeiro
 Wayde van Niekerk (RSA)  Kirani James (GRN)  LaShawn Merritt (USA)

Women

Games Gold Silver Bronze
1964 Tokyo
 Betty Cuthbert (AUS)  Ann Packer (GBR)  Judy Amoore (AUS)
1968 Mexico City
 Colette Besson (FRA)  Lillian Board (GBR)  Natalya Pechonkina (URS)
1972 Munich
 Monika Zehrt (GDR)  Rita Wilden (FRG)  Kathy Hammond (USA)
1976 Montreal
 Irena Szewińska (POL)  Christina Brehmer (GDR)  Ellen Streidt (GDR)
1980 Moscow
 Marita Koch (GDR)  Jarmila Kratochvílová (TCH)  Christina Lathan (GDR)
1984 Los Angeles
 Valerie Brisco-Hooks (USA)  Chandra Cheeseborough (USA)  Kathy Smallwood-Cook (GBR)
1988 Seoul
 Olga Bryzgina (URS)  Petra Müller (GDR)  Olga Nazarova (URS)
1992 Barcelona
 Marie-José Pérec (FRA)  Olga Bryzgina (EUN)  Ximena Restrepo (COL)
1996 Atlanta
 Marie-José Pérec (FRA)  Cathy Freeman (AUS)  Falilat Ogunkoya (NGR)
2000 Sydney
 Cathy Freeman (AUS)  Lorraine Graham (JAM)  Katharine Merry (GBR)
2004 Athens
 Tonique Williams-Darling (BAH)  Ana Guevara (MEX)  Natalya Antyukh (RUS)
2008 Beijing
 Christine Ohuruogu (GBR)  Shericka Williams (JAM)  Sanya Richards (USA)
2012 London
 Sanya Richards-Ross (USA)  Christine Ohuruogu (GBR)  DeeDee Trotter (USA)
2016 Rio de Janeiro
 Shaunae Miller (BAH)  Allyson Felix (USA)  Shericka Jackson (JAM)

World Championships medalists

Men

Games Gold Silver Bronze
1983 Helsinki  Bert Cameron (JAM)  Michael Franks (USA)  Sunder Nix (USA)
1987 Rome  Thomas Schönlebe (GDR)  Innocent Egbunike (NGA)  Harry Reynolds (USA)
1991 Tokyo  Antonio Pettigrew (USA)  Roger Black (GBR)  Danny Everett (USA)
1993 Stuttgart  Michael Johnson (USA)  Butch Reynolds (USA)  Samson Kitur (KEN)
1995 Gothenburg  Michael Johnson (USA)  Butch Reynolds (USA)  Greg Haughton (JAM)
1997 Athens  Michael Johnson (USA)  Davis Kamoga (UGA)  Tyree Washington (USA)
1999 Seville  Michael Johnson (USA)  Sanderlei Claro Parrela (BRA)  Alejandro Cárdenas (MEX)
2001 Edmonton  Avard Moncur (BAH)  Ingo Schultz (GER)  Greg Haughton (JAM)
2003 Saint-Denis  Tyree Washington (USA)  Marc Raquil (FRA)  Michael Blackwood (JAM)
2005 Helsinki  Jeremy Wariner (USA)  Andrew Rock (USA)  Tyler Christopher (CAN)
2007 Osaka  Jeremy Wariner (USA)  LaShawn Merritt (USA)  Angelo Taylor (USA)
2009 Berlin  LaShawn Merritt (USA)  Jeremy Wariner (USA)  Renny Quow (TRI)
2011 Daegu  Kirani James (GRN)  LaShawn Merritt (USA)  Kévin Borlée (BEL)
2013 Moscow  LaShawn Merritt (USA)  Tony McQuay (USA)  Luguelín Santos (DOM)
2015 Beijing  Wayde van Niekerk (RSA)  LaShawn Merritt (USA)  Kirani James (GRN)

Women

Games Gold Silver Bronze
1983 Helsinki  Jarmila Kratochvílová (TCH)  Taťána Kocembová (TCH)  Mariya Pinigina (URS)
1987 Rome  Olga Bryzgina (URS)  Petra Muller (GDR)  Kirsten Emmelmann (GDR)
1991 Tokyo  Marie-José Pérec (FRA)  Grit Breuer (GER)  Sandra Myers (ESP)
1993 Stuttgart  Jearl Miles (USA)  Natasha Kaiser-Brown (USA)  Sandie Richards (JAM)
1995 Gothenburg  Marie-José Pérec (FRA)  Pauline Davis (BAH)  Jearl Miles (USA)
1997 Athens  Cathy Freeman (AUS)  Sandie Richards (JAM)  Jearl Miles Clark (USA)
1999 Seville  Cathy Freeman (AUS)  Anja Rücker (GER)  Lorraine Graham-Fenton (JAM)
2001 Edmonton  Amy Mbacke Thiam (SEN)  Lorraine Fenton (JAM)  Ana Guevara (MEX)
2003 Saint-Denis  Ana Guevara (MEX)  Lorraine Fenton (JAM)  Amy Mbacke Thiam (SEN)
2005 Helsinki  Tonique Williams-Darling (BAH)  Sanya Richards (USA)  Ana Guevara (MEX)
2007 Osaka  Christine Ohuruogu (GBR)  Nicola Sanders (GBR)  Novlene Williams (JAM)
2009 Berlin  Sanya Richards (USA)  Shericka Williams (JAM)  Antonina Krivoshapka (RUS)
2011 Daegu  Amantle Montsho (BOT)  Allyson Felix (USA)  Anastasiya Kapachinskaya (RUS)
2013 Moscow  Christine Ohuruogu (GBR)  Amantle Montsho (BOT)  Antonina Krivoshapka (RUS)
2015 Beijing  Allyson Felix (USA)  Shaunae Miller (BAH)  Shericka Jackson (JAM)

Season's bests

As of August 14, 2016

Men

Year Time Athlete Location
1966 44.82y  Wendell Motley (TTO) Kingston
1967 44.74+h  Tommie Smith (USA) San Jose
1968 43.86A  Lee Evans (USA) Ciudad de México
1969 44.67y  Curtis Mills (USA) Knoxville
1970 45.01  Charles Asati (KEN) Edinburgh
1971 44.44yh  John Smith (USA) Eugene
1972 44.34h  Wayne Collett (USA) Eugene
1973 44.85y  Maurice Peoples (USA) Baton Rouge
1974 44.94h  Alberto Juantorena (CUB) Ciudad de México
1975 44.45A  Ronald Ray (USA) Ciudad de México
1976 44.26  Alberto Juantorena (CUB) Montreal
1977 44.65  Alberto Juantorena (CUB) La Habana
1978 44.27(A)  Alberto Juantorena (CUB) Medellin
1979 44.92  Harald Schmid (FRG) Stuttgart
1980 44.60  Viktor Markin (RUS) Moscow
1981 44.58  Bert Cameron (JAM) Baton Rouge
1982 44.68  Sunder Nix (USA) Indianapolis
1983 44.50  Erwin Skamrahl (FRG) München
1984 44.27  Alonzo Babers (USA) Los Angeles
1985 44.47  Michael Franks (USA) Canberra
1986 44.30  Gabriel Tiacoh (CIV) Indianapolis
1987 44.10  Harry Reynolds (USA) Columbus
1988 43.29  Harry Reynolds (USA) Zürich
1989 44.27  Antonio Pettigrew (USA) Houston
1990 44.06  Danny Everett (USA) Seville
1991 44.17  Michael Johnson (USA) Lausanne
1992 43.50  Quincy Watts (USA) Barcelona
1993 43.65  Michael Johnson (USA) Stuttgart
1994 43.90  Michael Johnson (USA) Madrid
1995 43.39  Michael Johnson (USA) Gothenburg
1996 43.44  Michael Johnson (USA) Atlanta
1997 43.75  Michael Johnson (USA) Waco
1998 43.68  Michael Johnson (USA) Zürich
1999 43.18  Michael Johnson (USA) Sevilla
2000 43.68  Michael Johnson (USA) Sacramento
2001 44.28  Tyree Washington (USA) Los Angeles
2002 44.45  Leonard Byrd (USA) Belém
2003 44.33  Tyree Washington (USA) Palo Alto
2004 44.00  Jeremy Wariner (USA) Athens
2005 43.93  Jeremy Wariner (USA) Helsinki
2006 43.62  Jeremy Wariner (USA) Rome
2007 43.45  Jeremy Wariner (USA) Osaka
2008 43.75  LaShawn Merritt (USA) Beijing
2009 44.06  LaShawn Merritt (USA) Berlin
2010 44.13  Jeremy Wariner (USA) Zürich
2011 44.35  LaShawn Merritt (USA) Daegu
2012 43.94  Kirani James (GRN) London
2013 43.74  LaShawn Merritt (USA) Moscow
2014 43.74  Kirani James (GRN) Lausanne
2015 43.48  Wayde van Niekerk (RSA) Beijing
2016 43.03  Wayde van Niekerk (RSA) Rio de Janeiro

Women

Year Time Athlete Location
1966
1967
1968 52.03  Colette Besson (FRA) Mexico
1969 51.72  Nicole Duclos (FRA) Athens
1970 51.02  Marilyn Neufville (JAM) Edinburgh
1971 52.14  Helga Seidler (GDR) Helsinki
1972 51.08  Monika Zehrt (GDR) Munich
1973 51.27  Mona-Lisa Pursiainen (FIN) Helsinki
1974 50.14  Riitta Salin (FIN) Rome
1975 50.50  Irena Szewinska (POL) Nice
1976 49.28  Irena Szewinska (POL) Montreal
1977 49.52  Irena Szewinska (POL) Düsseldorf
1978 48.94  Marita Koch (GDR) Prague
1979 48.89  Marita Koch (GDR) Potsdam
1980 48.88  Marita Koch (GDR) Moscow
1981 48.61  Jarmila Kratochvílová (CZE) Rome
1982 48.16  Marita Koch (GDR) Athens
1983 47.99  Jarmila Kratochvílová (CZE) Helsinki
1984 48.16  Marita Koch (GDR) Prague
1985 47.60  Marita Koch (GDR) Canberra
1986 48.22  Marita Koch (GDR) Stuttgart
1987 49.38  Olga Bryzgina (UKR) Rome
1988 48.65  Olga Bryzgina (UKR) Seoul
1989 50.01  Ana Fidelia Quirot (CUB) Duisburg
1990 49.50  Grit Breuer (GER) Split
1991 49.32  Marie-José Pérec (FRA) Frankfurt
1992 48.83  Marie-José Pérec (FRA) Frankfurt
1993 49.81  Ma Yuqin (CHN) Beijing
1994 49.77  Marie-José Pérec (FRA) Paris
1995 49.28  Marie-José Pérec (FRA) Gothenburg
1996 48.25  Marie-José Pérec (FRA) Atlanta
1997 49.39  Cathy Freeman (AUS) Oslo
1998 49.29  Charity Opara (NGR) Rome
1999 49.62  Falilat Ogunkoya (NGR) Lagos
2000 49.11  Cathy Freeman (AUS) Sydney
2001 49.59  Katharine Merry (GBR) Athens
2002 49.16  Ana Guevara (MEX) Zürich
2003 48.89  Ana Guevara (MEX) Saint-Denis
2004 49.07  Tonique Williams-Darling (BAH) Berlin
2005 48.92  Sanya Richards-Ross (USA) Zürich
2006 48.70  Sanya Richards-Ross (USA) Athens
2007 49.27  Sanya Richards-Ross (USA) Berlin
Stuttgart
2008 49.62  Christine Ohuruogu (GBR) Beijing
2009 48.83  Sanya Richards-Ross (USA) Brussels
2010 49.64  Debbie Dunn (USA) Des Moines
2011 49.35  Anastasiya Kapachinskaya (RUS) Cheboksary
2012 49.16  Antonina Krivoshapka (RUS) Cheboksary
2013 49.33  Amantle Montsho (BOT) Monaco
2014 49.48  Francena McCorory (USA) Sacramento
2015 49.26  Allyson Felix (USA) Beijing
2016 49.44  Shaunae Miller (BAH) Rio de Janeiro

Notes and references

  1. Canadian Journal of Applied Sport Sciences, "Aerobic versus anaerobic training for success in various athletic events" by Shepard, R. J., 1978
  2. http://www.flightunit.com/uncategorized/who-oscar-pistorius-is/
  3. "Men's 400m Results" (PDF). Rio 2016 official website. 14 August 2016. Retrieved 15 August 2016.
  4. "400m Results". IAAF. 26 August 2015. Retrieved 26 August 2015.
  5. "400m Results" (PDF). www.sep-olympic.ch. 5 July 2015. Retrieved 5 July 2015.
  6. http://www.diamondleague-lausanne.com/en/Live-StartlistsResults/Overview/400m/
  7. "400m Men - Heats Results". IAAF. 23 August 2015. Retrieved 23 August 2015.
  8. "400m Men - Heats Results". IAAF. 23 August 2015. Retrieved 23 August 2015.
  9. "Men's 400m Results" (PDF). Rio 2016 official website. 14 August 2016. Retrieved 15 August 2016.
  10. "400m Results". IAAF. 26 August 2015. Retrieved 26 August 2015.
  11. "400m Results". IAAF. 27 August 2015. Retrieved 27 August 2015.
  12. https://smsprio2016-a.akamaihd.net/_odf-documents/A/T/ATM404101_Results_2016_08_20_3f946dd6_c984_4e33_bf39_31afec5beb68.pdf

External links

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