# 2012 World Junior Championships in Athletics – Men's 400 metres

The men's 400 metres at the 2012 World Junior Championships in Athletics will be held at the Estadi Olímpic Lluís Companys on 10, 11, and 12 July.

## Medalists

| Gold | Arman Hall United States |
| Silver | Steven Solomon Australia |
| Silver | Aldrich Bailey United States |

## Records

Prior to the competition, the existing world junior and championship records were as follows.
| World Junior Record | Steve Lewis (USA) | 43.87 | Seoul, South Korea | 28 September 1988 |
| Championship Record | Hamdan Al-Bishi (KSA) | 44.66 | Santiago, Chile | 20 October 2000 |
| World Junior Leading | Luguelín Santos (DOM) | 44.45 | Hengelo, Netherlands | 27 May 2012 |

## Results
### Heats

Qualification: The first 2 of each heat (Q) and the 8 fastest times (q) qualified
| Rank | Heat | Lane | Name | Nationality | Time | Note |
| 1 | 6 | 8 | Arman Hall | United States | 46.13 | Q |
| 2 | 1 | 5 | Boniface Ontuga Mweresa | Kenya | 46.16 | Q |
| 2 | 7 | 5 | Steven Solomon | Australia | 46.16 | Q |
| 4 | 4 | 3 | Alphas Leken Kishoyian | Kenya | 46.22 | Q |
| 5 | 6 | 7 | Mateo Ružic | Croatia | 46.30 | Q, PB |
| 6 | 5 | 5 | Javon Francis | Jamaica | 46.31 | Q, PB |
| 6 | 6 | 3 | Michele Tricca | Italy | 46.31 | q, SB |
| 8 | 5 | 2 | Luguelín Santos | Dominican Republic | 46.34 | Q |
| 9 | 8 | 4 | Aldrich Bailey | United States | 46.40 | Q |
| 10 | 7 | 4 | Julio Arenas | Spain | 46.42 | Q, PB |
| 11 | 7 | 3 | José Meléndez | Venezuela | 46.45 | q, PB |
| 12 | 2 | 6 | Machel Cedenio | Trinidad and Tobago | 46.58 | Q |
| 13 | 5 | 7 | Andrew Whyte | New Zealand | 46.62 | q, PB |
| 14 | 2 | 5 | O'Jay Ferguson | Bahamas | 46.69 | Q |
| 15 | 8 | 8 | Pieter Conradie | South Africa | 46.70 | Q |
| 16 | 6 | 4 | Daniel Gyasi | Ghana | 46.85 | q, PB |
| 17 | 1 | 2 | Patryk Dobek | Poland | 46.90 | Q |
| 18 | 3 | 2 | Stephan James | Guyana | 46.99 | Q, NJ |
| 18 | 5 | 6 | Sorin Vatamanu | Romania | 46.99 | q |
| 20 | 4 | 9 | Jarryd Buchan | Australia | 47.04 | Q |
| 21 | 8 | 5 | Basheer Atiah Al Barakati | Saudi Arabia | 47.07 | q, PB |
| 22 | 1 | 6 | Marco Lorenzi | Italy | 47.19 | q |
| 23 | 8 | 3 | Nikita Vesnin | Russia | 47.22 | q |
| 24 | 7 | 8 | Lennox Williams | Jamaica | 47.31 | |
| 25 | 3 | 8 | Nikita Uglov | Russia | 47.37 | Q |
| 25 | 7 | 9 | Rafał Smoleń | Poland | 47.37 | |
| 27 | 8 | 2 | Shaquille Dill | Bermuda | 47.38 | |
| 28 | 1 | 4 | Sondre Nyvold Lid | Norway | 47.40 | |
| 29 | 1 | 7 | Talbert Poleon | Saint Lucia | 47.45 | |
| 30 | 3 | 7 | Diego Palomeque | Colombia | 47.55 | |
| 31 | 4 | 6 | Ruan Greyling | South Africa | 47.65 | |
| 32 | 4 | 8 | Bandar Atiyah Kaabi | Saudi Arabia | 47.79 | |
| 33 | 6 | 6 | Luis Alonso Murillo | Costa Rica | 47.85 | |
| 34 | 5 | 3 | Lucka Raherindrainy | Madagascar | 47.90 | PB |
| 35 | 7 | 2 | Asa Guevara | Trinidad and Tobago | 47.93 | |
| 36 | 3 | 5 | Kazushi Kimura | Japan | 47.98 | |
| 37 | 8 | 1 | Oleksiy Pozdnyakov | Ukraine | 48.00 | |
| 38 | 5 | 1 | Kenta Kimura | Japan | 48.03 | |
| 38 | 6 | 9 | José Ricardo Jiménez | Mexico | 48.03 | |
| 40 | 3 | 3 | Benjamin Ayesu-Attah | Canada | 48.08 | |
| 41 | 3 | 9 | Roy Ravana | Fiji | 48.17 | |
| 42 | 6 | 2 | Elroy McBride | Bahamas | 48.18 | |
| 43 | 5 | 9 | Dávid Bartha | Hungary | 48.32 | |
| 44 | 1 | 8 | Marc-André Alexandre | Canada | 48.37 | |
| 45 | 2 | 7 | Jani Koskela | Finland | 48.46 | |
| 46 | 8 | 9 | Kwame Donyinah | Ghana | 48.55 | |
| 47 | 2 | 4 | Chin Hui Ng | Singapore | 48.56 | |
| 48 | 1 | 9 | Alexander Rohani | Iran | 48.59 | |
| 49 | 4 | 7 | Alexandru Babian | Moldova | 48.63 | |
| 50 | 1 | 3 | Sumit Malik | India | 48.82 | |
| 50 | 4 | 5 | Miloš Raovic | Serbia | 48.82 | |
| 52 | 5 | 4 | Victor Soares | Portugal | 48.93 | |
| 52 | 8 | 6 | Brandon Valentine-Parris | Saint Vincent and the Grenadines | 48.93 | PB |
| 54 | 4 | 4 | Lucas Bua | Spain | 48.94 | |
| 55 | 2 | 3 | Mohamedine Mahamadou | Niger | 49.05 | |
| 56 | 2 | 2 | D. Madushanka Ranasinghearachchilage | Sri Lanka | 49.43 | |
| 57 | 2 | 8 | José Fernando Martínez | Mexico | 49.71 | |
| 58 | 5 | 8 | Marcio Cruz | Nicaragua | 50.77 | PB |
| 59 | 7 | 7 | Abdelkhedere Abdelrahaman Abdelbassit | Chad | 50.80 | PB |
| 60 | 3 | 4 | Mohammed Al Shueili | Oman | 51.04 | |
| | 6 | 5 | John Rivan | Papua New Guinea | DQ | |
| | 7 | 6 | Andreas Roth | Norway | DNF | |
| | 2 | 9 | Sadam Suliman Koumi | Sudan | DNS | |
| | 3 | 6 | Mohamed Belbachir | Algeria | DNS | |
| | 4 | 2 | Madunta Chukwuma | Nigeria | DNS | |
| | 8 | 7 | Gedeon Tshimanga Mutombo | Democratic Republic of the Congo | DNS | |

### Semi-final

Qualification: The first 2 of each heat (Q) and the 2 fastest times (q) qualified
| Rank | Heat | Lane | Name | Nationality | Time | Note |
| 1 | 3 | 4 | Aldrich Bailey | United States | 45.79 | Q |
| 2 | 1 | 7 | Luguelín Santos | Dominican Republic | 45.98 | Q |
| 3 | 3 | 5 | Javon Francis | Jamaica | 46.06 | Q, PB |
| 4 | 1 | 4 | Steven Solomon | Australia | 46.07 | Q |
| 5 | 3 | 5 | Boniface Ontuga Mweresa | Kenya | 46.20 | q |
| 6 | 2 | 4 | Arman Hall | United States | 46.42 | Q |
| 7 | 1 | 6 | Alphas Leken Kishoyian | Kenya | 46.46 | q (*) |
| 8 | 1 | 8 | Nikita Uglov | Russia | 46.49 | q |
| 9 | 3 | 2 | Patryk Dobek | Poland | 46.56 | |
| 10 | 2 | 6 | Machel Cedenio | Trinidad and Tobago | 46.59 | Q |
| 11 | 2 | 2 | Andrew Whyte | New Zealand | 46.81 | |
| 12 | 3 | 9 | Jarryd Buchan | Australia | 46.81 | PB |
| 13 | 2 | 8 | José Meléndez | Venezuela | 46.83 | |
| 14 | 2 | 9 | Pieter Conradie | South Africa | 46.87 | |
| 15 | 1 | 9 | Michele Tricca | Italy | 46.92 | |
| 16 | 2 | 7 | O'Jay Ferguson | Bahamas | 47.02 | |
| 17 | 3 | 6 | Marco Lorenzi | Italy | 47.25 | |
| 18 | 2 | 5 | Stephan James | Guyana | 47.35 | |
| 19 | 1 | 5 | Mateo Ružic | Croatia | 47.46 | |
| 20 | 1 | 3 | Basheer Atiah Al Barakati | Saudi Arabia | 47.48 | |
| 21 | 3 | 4 | Daniel Gyasi | Ghana | 47.78 | |
| 22 | 2 | 3 | Nikita Vesnin | Russia | 48.02 | |
| 23 | 1 | 2 | Sorin Vatamanu | Romania | 48.15 | |
| 24 | 3 | 4 | Julio Arenas | Spain | 50.00 | |
*Alphas Leken Kishoyian had originally finished in 48.39, the last in his heat, but, since the starter's gun had fired before he settled in his blocks, a rerun was ordered in which he had to run by himself faster than 46.49, the time of the last fastest loser. He succeeded and was given the place in the final.

### Final

| Rank | Lane | Name | Nationality | Time | Note |
| | 6 | Luguelín Santos | Dominican Republic | 44.85 | |
| | 4 | Arman Hall | United States | 45.39 | PB |
| | 8 | Steven Solomon | Australia | 45.52 | PB |
| | 5 | Aldrich Bailey | United States | 45.52 | |
| 5 | 9 | Machel Cedenio | Trinidad and Tobago | 46.17 | |
| 6 | 1 | Alphas Leken Kishoyian | Kenya | 46.19 | |
| 7 | 3 | Boniface Ontuga Mweresa | Kenya | 46.50 | |
| 8 | 2 | Nikita Uglov | Russia | 46.61 | |
| 9 | 7 | Javon Francis | Jamaica | 47.57 | |

## Participation

According to an unofficial count, 62 athletes from 45 countries participated in the event.
* Australia (2)
* Bahamas (2)
* Bermuda (1)
* Canada (2)
* Chad (1)
* Colombia (1)
* Costa Rica (1)
* Croatia (1)
* Dominican Republic (1)
* Fiji (1)
* Finland (1)
* Ghana (2)
* Guyana (1)
* Hungary (1)
* India (1)
* Iran (1)
* Italy (2)
* Jamaica (2)
* Japan (2)
* Kenya (2)
* Madagascar (1)
* Mexico (2)
* Moldova (1)
* New Zealand (1)
* Nicaragua (1)
* Niger (1)
* Norway (2)
* Oman (1)
* Papua New Guinea (1)
* Poland (2)
* Portugal (1)
* Romania (1)
* Russia (2)
* Saint Lucia (1)
* Saint Vincent and the Grenadines (1)
* Saudi Arabia (2)
* Serbia (1)
* Singapore (1)
* South Africa (2)
* Spain (2)
* Sri Lanka (1)
* Trinidad and Tobago (2)
* Ukraine (1)
* United States (2)
* Venezuela (1)