# 2011 World Youth Championships in Athletics – Boys' 400 metres

The boys' 400 metres at the 2011 World Youth Championships in Athletics was held at the Stadium Lille Métropole on 6, 7 and 8 July.

## Medalists

| Gold | Silver | Bronze |
| Arman Hall United States | Alphas Kishoyian Kenya | Patryk Dobek Poland |

## Records

Prior to the competition, the following records were as follows.
| World Youth Best | Obea Moore (USA) | 45.14 | Santiago, Chile | 2 September 1995 |
| Championship Record | Kirani James (GRN) | 45.24 | Brixen, Italy | 10 July 2009 |
| World Youth Leading | Arman Hall (USA) | 46.22 | Winter Park, United States | 7 May 2011 |
During the competition, Arman Hall lowered his own world youth-leading 46.22 to post the second-fastest in championship history, 46.01.

## Heats

Qualification rule: first 3 of each heat (Q) plus the 3 fastest times (q) qualified.

### Heat 1

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 7 | Machel Cedenio | Trinidad and Tobago | 47.32 | Q |
| 2 | 3 | Shotaro Akiyo | Japan | 47.74 | Q |
| 3 | 6 | Pieter Conradie | South Africa | 47.83 | Q |
| 4 | 8 | José de Jesús Fraire | Mexico | 48.67 | q |
| 5 | 4 | Sibongakonke Matsenjwa | Swaziland | 48.73 | PB |
| 6 | 2 | Mohamedine Mahamadou | Niger | 48.78 | PB |
| 7 | 1 | Maykon Pedro da Cunha | Brazil | 49.32 | PB |
| 8 | 5 | Mohmmed Al Shueili | Oman | 49.50 | |

### Heat 2

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 2 | Thomas Jordier | France | 47.89 | Q, PB |
| 2 | 4 | David Kipkemoi Chemjor | Kenya | 48.15 | Q |
| 3 | 3 | Mateo Ružić | Croatia | 48.39 | Q |
| 4 | 5 | Samvel Grigoryan | Armenia | 49.64 | PB |
| 5 | 8 | Zied Aissa | Tunisia | 49.72 | |
| 6 | 6 | Lennox Williams | Jamaica | 50.01 | |
| 7 | 1 | George Manebona | Solomon Islands | 51.65 | SB |
| - | 7 | Japhet Samuel | Nigeria | DQ | |

### Heat 3

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 6 | Sadam Koumi | Sudan | 47.59 | Q |
| 2 | 4 | Dongbaek Choi | South Korea | 47.87 | Q, SB |
| 3 | 2 | Carlos Eduardo Grachet | Brazil | 48.20 | Q |
| 4 | 5 | Jack Sheridan | Australia | 48.48 | q |
| 5 | 8 | Sondre Nyvold Lid | Norway | 48.86 | |
| 6 | 1 | Attila Farkas | Hungary | 49.77 | |
| 7 | 3 | Jordan Geenen | France | 49.96 | |
| 8 | 7 | Abdelkhedere Abdelbassit Abdelrahmane | Chad | 51.54 | PB |

### Heat 4

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | Najee Glass | United States | 47.92 | Q |
| 2 | 1 | Patryk Dobek | Poland | 48.13 | Q |
| 3 | 7 | Timofey Chalyy | Russia | 48.49 | Q |
| 4 | 5 | Oleksiy Pozdnyakov | Ukraine | 48.92 | PB |
| 5 | 3 | Nathaniel George | Canada | 49.90 | |
| 6 | 6 | Sandeep - | India | 49.94 | |
| 7 | 8 | Sergi Torres | Spain | 51.42 | |
| 8 | 2 | Omar Alkhatib | Palestine | 54.93 | PB |

### Heat 5

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 3 | Arman Hall | United States | 46.76 | Q |
| 2 | 2 | Brendon Restall | Canada | 47.31 | Q, PB |
| 3 | 7 | Lorenzo Adams | South Africa | 48.05 | Q |
| 4 | 5 | Basheer Atiah Al Barakati | Saudi Arabia | 49.42 | |
| 5 | 1 | Jørgen Kåshagen | Norway | 50.34 | |
| 6 | 6 | Ever Carranza | Mexico | 50.60 | |
| 7 | 4 | Jatin Jain | India | 54.03 | |

### Heat 6

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 6 | Jarryd Buchan | Australia | 47.12 | Q, PB |
| 2 | 7 | Takuya Fukunaga | Japan | 47.24 | Q, PB |
| 3 | 1 | Alphas Kishoyian | Kenya | 47.31 | Q |
| 4 | 5 | Rafał Smoleń | Poland | 48.04 | q, PB |
| 5 | 4 | Lucas Búa | Spain | 49.04 | |
| 6 | 3 | Miloš Raović | Serbia | 49.07 | PB |
| 7 | 2 | Lahiru Jamuni | Sri Lanka | 49.26 | PB |
| - | 8 | Aleksandr Lukyanenko | Turkmenistan | DQ | |

### Heat 7

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 5 | Alex Boyce | Great Britain | 47.82 | Q, PB |
| 2 | 8 | Andre Wells | Bahamas | 47.87 | Q |
| 3 | 3 | Ahmed Yahya Al Khayri | Saudi Arabia | 48.78 | Q, PB |
| 4 | 4 | Nitipol Thongpoon | Thailand | 49.72 | |
| 5 | 1 | Bariadora Friday Tamunosia | Nigeria | 49.97 | |
| 6 | 7 | Dónald Arias | Costa Rica | 50.25 | |
| 7 | 6 | Usama Al-Gheilani | Oman | 54.25 | |
| - | 2 | Bernardo Baloyes | Colombia | DQ | |

## Semifinals

Qualification rule: first 2 of each heat (Q) plus the 2 fastest times (q) qualified.

### Heat 1

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 6 | Takuya Fukunaga | Japan | 47.30 | Q |
| 2 | 3 | Andre Wells | Bahamas | 47.36 | Q |
| 3 | 4 | Najee Glass | United States | 47.42 | |
| 4 | 5 | Jarryd Buchan | Australia | 47.53 | |
| 5 | 8 | David Kipkemoi Chemjor | Kenya | 47.90 | |
| 6 | 7 | Lorenzo Adams | South Africa | 48.01 | |
| 7 | 1 | Timofey Chalyy | Russia | 48.45 | |
| 8 | 2 | José de Jesús Fraire | Mexico | 49.60 | |

### Heat 2

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 6 | Arman Hall | United States | 46.70 | Q |
| 2 | 7 | Patryk Dobek | Poland | 47.19 | Q, PB |
| 3 | 3 | Thomas Jordier | France | 47.27 | PB |
| 4 | 8 | Carlos Eduardo Grachet | Brazil | 47.58 | PB |
| 5 | 4 | Alex Boyce | Great Britain | 47.96 | |
| 6 | 5 | Dongbaek Choi | South Korea | 48.18 | |
| 7 | 1 | Jack Sheridan | Australia | 49.39 | |
| 8 | 2 | Mateo Ružić | Croatia | 50.57 | |

### Heat 3

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 8 | Alphas Kishoyian | Kenya | 46.52 | Q |
| 2 | 6 | Sadam Koumi | Sudan | 47.08 | Q |
| 3 | 4 | Machel Cedenio | Trinidad and Tobago | 47.12 | q |
| 4 | 3 | Brendon Restall | Canada | 47.26 | q, PB |
| 5 | 5 | Shotaro Aikyo | Japan | 47.42 | PB |
| 6 | 7 | Pieter Conradie | South Africa | 47.58 | |
| 7 | 2 | Ahmed Yahya Al Khayri | Saudi Arabia | 48.57 | |
| | 1 | Rafał Smoleń | Poland | DQ | |

## Final

| Rank | Lane | Name | Nationality | Time | Notes |
| | 4 | Arman Hall | United States | 46.01 | WYL |
| | 6 | Alphas Kishoyian | Kenya | 46.58 | |
| | 8 | Patryk Dobek | Poland | 46.67 | PB |
| 4 | 2 | Machel Cedenio | Trinidad and Tobago | 46.89 | PB |
| 5 | 5 | Takuya Fukunaga | Japan | 47.16 | PB |
| 6 | 7 | Andre Wells | Bahamas | 47.22 | |
| 7 | 1 | Brendon Restall | Canada | 47.34 | |
| | 3 | Sadam Koumi | Sudan | DNF | |