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The men's 400 metres at the 2009 World Championships in Athletics was held at the Olympic Stadium on 18, 19 and 21 August. The winning margin was 0.54 seconds.
The United States had a strong tradition in the event, with an American topping the Olympic 400 m podium every time since the 1988 Olympics. Similar to the 2007 World Championships, Jeremy Wariner and LaShawn Merritt were the clear favourites. However, on this occasion, recent form favoured the Olympic champion Merritt instead of the reigning world champion Wariner. Both Americans were undefeated that season but Merritt held the world-leading time of 44.50 seconds. A gold or silver medallist outside of these two competitors seemed unlikely; Bahamian Chris Brown, Irishman David Gillick, Frenchman Leslie Djhone and the other two runners from the United States (Gil Roberts and Lionel Larry) were seen to be capable of a bronze at best.[1]
On the first day, Ramon Miller surprised as the fastest qualifier in the heats, scoring a new personal best of 45 seconds. Tabarie Henry, Djhone and Renny Quow were the next fastest, and African record holder Gary Kikaya was most high-profile casualty of the first round, having been disqualified for a lane infraction.[2]
| Gold | Silver | Bronze |
LaShawn Merritt United States (USA) |
Jeremy Wariner United States (USA) |
Renny Quow Trinidad and Tobago (TRI) |
Prior to the competition, the established records were as follows.
| World record |  Michael Johnson (USA) |
43.18 | Seville, Spain | 26 August 1999 |
| Championship record | Michael Johnson (USA) |
43.18 | Seville, Spain | 26 August 1999 |
| World Leading | LaShawn Merritt (USA) |
44.50 | Baie-Mahault, France | 3 July 2009 |
| African record |  Gary Kikaya (COD) |
44.10 | Stuttgart, Germany | 9 September 2006 |
| Asian record |  Mohamed Amer Al-Malky (OMA) |
44.56 | Budapest, Hungary | 12 August 1988 |
| North American record | Michael Johnson (USA) |
43.18 | Seville, Spain | 26 August 1999 |
| South American record |  Sanderlei Parrela (BRA) |
44.29 | Seville, Spain | 26 August 1999 |
| European record |  Thomas Schönlebe (GDR) |
44.33 | Rome, Italy | 3 September 1987 |
| Oceanian record |  Darren Clark (AUS) |
44.38 | Seoul, South Korea | 26 September 1988 |
| A time | B time |
|---|---|
| 45.55 | 45.95 |
| Date | Time | Round |
|---|---|---|
| August 18, 2009 | 11:05 | Heats |
| August 19, 2009 | 18:15 | Semifinals |
| August 21, 2009 | 21:20 | Final |
Heats
Qualification: First 3 in each heat(Q) and the next 3 fastest(q) advance to the semifinals.
Key: NR = National record, PB = Personal best, Q = qualification by place in heat, q = qualification by overall place, SB = Seasonal best
Semifinals
First 2 in each semifinal(Q) and the next 2 fastest(q) advance to the final.
| Rank | Heat | Name | Nationality | Time | Notes |
|---|---|---|---|---|---|
| 1 | 2 | LaShawn Merritt | United States (USA) | 44.37 | Q, WL |
| 2 | 2 | Renny Quow | Trinidad and Tobago (TRI) | 44.53 | Q, PB |
| 3 | 1 | Jeremy Wariner | United States (USA) | 44.69 | Q |
| 4 | 1 | Michael Bingham |  Great Britain & N.I. (GBR) | 44.74 | Q, PB |
| 5 | 1 | Leslie Djhone |  France (FRA) | 44.80 | q, SB |
| 6 | 1 | David Gillick |  Ireland (IRL) | 44.88 | q |
| 7 | 2 | William Collazo |  Cuba (CUB) | 44.93 | |
| 8 | 3 | Chris Brown |  Bahamas (BAH) | 44.95 | Q |
| 9 | 3 | Tabarie Henry |  U.S. Virgin Islands (ISV) | 44.97 | Q |
| 10 | 1 | Ramon Miller | Bahamas (BAH) | 44.99 | PB |
| 11 | 3 | Ricardo Chambers |  Jamaica (JAM) | 45.13 | SB |
| 12 | 3 | Kevin Borlée |  Belgium (BEL) | 45.28 | SB |
| 13 | 2 | Sean Wroe |  Australia (AUS) | 45.32 | |
| 14 | 3 | John Steffensen | Australia (AUS) | 45.50 | |
| 15 | 2 | Erison Hurtault |  Dominica (DMA) | 45.59 | |
| 16 | 2 | Rabah Yousif |  Sudan (SUD) | 45.63 | |
| 17 | 3 | Lionel Larry | United States (USA) | 45.85 | |
| 18 | 3 | Robert Tobin | Great Britain & N.I. (GBR) | 45.90 | |
| 19 | 2 | Martyn Rooney | Great Britain & N.I. (GBR) | 45.98 | |
| 20 | 1 | Joel Milburn | Australia (AUS) | 46.06 | |
| 21 | 2 | Teddy Venel | France (FRA) | 46.30 | |
| 22 | 1 | Mohamed Ashour Khouaja |  Libya | 46.43 | |
| 23 | 3 | Matteo Galvan |  Italy (ITA) | 46.87 | |
| 1 | Johan Wissman |  Sweden (SWE) | DNS |
Final
| Rank | Name | Nationality | Time | Notes |
|---|---|---|---|---|
 | LaShawn Merritt | United States (USA) | 44.06 | WL |
 | Jeremy Wariner | United States (USA) | 44.60 | SB |
 | Renny Quow | Trinidad and Tobago (TRI) | 45.02 | |
| 4 | Tabarie Henry | U.S. Virgin Islands (ISV) | 45.42 | |
| 5 | Chris Brown | Bahamas (BAH) | 45.47 | |
| 6 | David Gillick | Ireland (IRL) | 45.53 | |
| 7 | Michael Bingham | Great Britain & N.I. (GBR) | 45.56 | |
| 8 | Leslie Djhone | France (FRA) | 45.90 |
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