# 2008 World Junior Championships in Athletics – Men's 400 metres

The men's 400 metres event at the 2008 World Junior Championships in Athletics was held in Bydgoszcz, Poland, at Zawisza Stadium on 8, 9 and 10 July.

## Medalists

| Gold | Marcus Boyd United States |
| Silver | Kirani James Grenada |
| Bronze | O'Neal Wilder United States |

## Results
### Final

10 July
| Rank | Name | Nationality | Time | Notes |
| | Marcus Boyd | United States | 45.53 | |
| | Kirani James | Grenada | 45.70 | |
| | O'Neal Wilder | United States | 45.76 | |
| 4 | Kurt Mulcahy | Australia | 46.54 | |
| 5 | Niklas Zender | Germany | 46.78 | |
| 6 | Daniel Harper | Canada | 47.20 | |
| 7 | Jordan McGrath | United Kingdom | 47.81 | |
| | Brian Gregan | Ireland | DQ | IAAF rule 163.3 |

### Semifinals

9 July

#### Semifinal 1

| Rank | Name | Nationality | Time | Notes |
| 1 | Kirani James | Grenada | 46.55 | Q |
| 2 | Marcus Boyd | United States | 46.88 | Q |
| 3 | Petr Vaněk | Czech Republic | 47.22 | |
| 4 | Marcell Deák Nagy | Hungary | 47.43 | |
| 5 | Jānis Leitis | Latvia | 47.51 | |
| 6 | Awad El-Karim Makki | Sudan | 48.21 | |
| 7 | Juan Lewis | Bahamas | 48.30 | |
| 8 | Hideyuki Hirose | Japan | 48.30 | |
| 9 | Akihiro Urano | Japan | 48.34 | |

#### Semifinal 2

| Rank | Name | Nationality | Time | Notes |
| 1 | Niklas Zender | Germany | 46.78 | Q |
| 2 | Brian Gregan | Ireland | 46.88 | Q |
| 3 | Nigel Levine | United Kingdom | 47.14 | |
| 4 | Zwede Hewitt | Trinidad and Tobago | 47.36 | |
| 5 | Vladimir Krasnov | Russia | 47.38 | |
| 6 | Silvester Kirwa Meli | Kenya | 47.73 | |
| 7 | Pétros Kiriakídis | Greece | 48.03 | |
| 8 | Ismail Al-Sabani | Saudi Arabia | 48.04 | |

#### Semifinal 3

| Rank | Name | Nationality | Time | Notes |
| 1 | O'Neal Wilder | United States | 46.08 | Q |
| 2 | Kurt Mulcahy | Australia | 46.56 | Q |
| 3 | Daniel Harper | Canada | 46.81 | q |
| 4 | Jordan McGrath | United Kingdom | 47.13 | q |
| 5 | Rondell Bartholomew | Grenada | 47.60 | |
| 6 | Juan Carlos Vega | Puerto Rico | 47.94 | |
| 7 | Mauritz Kåshagen | Norway | 48.22 | |
| 8 | Curtis Kock | Netherlands Antilles | 48.36 | |

### Heats

8 July

#### Heat 1

| Rank | Name | Nationality | Time | Notes |
| 1 | Niklas Zender | Germany | 47.34 | Q |
| 2 | Juan Lewis | Bahamas | 47.78 | Q |
| 3 | Marcell Deák Nagy | Hungary | 47.85 | Q |
| 4 | Arkadiusz Wojno | Poland | 48.17 | |
| 5 | Bacar Jannot | Comoros | 48.38 | |
| 6 | Alejandro Guerrero | Spain | 49.20 | |
| 7 | Alessandro Pedrazzoli | Italy | 50.80 | |
| | Victor Isaiah | Nigeria | DQ | IAAF rule 163.3 |

#### Heat 2

| Rank | Name | Nationality | Time | Notes |
| 1 | Hideyuki Hirose | Japan | 47.86 | Q |
| 2 | Jānis Leitis | Latvia | 47.95 | Q |
| 3 | Pétros Kiriakídis | Greece | 48.24 | Q |
| 4 | Darnell Greig | Trinidad and Tobago | 48.42 | |
| 5 | Yonas Al-Hosah | Saudi Arabia | 48.47 | |
| 6 | Roman Starukh | Ukraine | 48.90 | |
| 7 | Juraj Mokráš | Slovakia | 49.29 | |
| 8 | Noah Akwu | Nigeria | 49.45 | |

#### Heat 3

| Rank | Name | Nationality | Time | Notes |
| 1 | O'Neal Wilder | United States | 46.82 | Q |
| 2 | Juan Carlos Vega | Puerto Rico | 48.03 | Q |
| 3 | Curtis Kock | Netherlands Antilles | 48.21 | Q |
| 4 | Kevin Williams | Jamaica | 48.42 | |
| 5 | Denys Teslenko | Ukraine | 48.49 | |
| 6 | Marc Orozco | Spain | 48.61 | |
| 7 | Tom Chouquet | France | 49.06 | |
| 8 | Marvin Augustine | Dominica | 52.08 | |
| 9 | Peter Semper | Montserrat | 54.87 | |

#### Heat 4

| Rank | Name | Nationality | Time | Notes |
| 1 | Kirani James | Grenada | 46.53 | Q |
| 2 | Daniel Harper | Canada | 47.18 | Q |
| 3 | Jordan McGrath | United Kingdom | 47.38 | Q |
| 4 | Vladimir Krasnov | Russia | 47.73 | q |
| 5 | Domenico Fontana | Italy | 47.99 | |
| 6 | Pascal Nabow | Germany | 48.06 | |
| 7 | La'Sean Pickstock | Bahamas | 48.54 | |
| 8 | Akino Ming | Jamaica | 49.08 | |

#### Heat 5

| Rank | Name | Nationality | Time | Notes |
| 1 | Brian Gregan | Ireland | 47.32 | Q |
| 2 | Silvester Kirwa Meli | Kenya | 47.34 | Q |
| 3 | Ismail Al-Sabani | Saudi Arabia | 47.39 | Q |
| 4 | Petr Vaněk | Czech Republic | 47.78 | q |
| 5 | Jakub Krzewina | Poland | 47.97 | |
| 6 | Rasmus Olsen | Denmark | 48.46 | |
| 7 | Hafidhou Attoumani | France | 48.56 | |
| 8 | Fadi Ba-Hafs | Yemen | 51.53 | |

#### Heat 6

| Rank | Name | Nationality | Time | Notes |
| 1 | Marcus Boyd | United States | 47.56 | Q |
| 2 | Rondell Bartholomew | Grenada | 47.85 | Q |
| 3 | Awad El-Karim Makki | Sudan | 47.93 | Q |
| 4 | Erik Voncina | Slovenia | 48.20 | |
| 5 | Zoltán Kovács | Hungary | 48.25 | |
| 6 | Endrik Zilberstein | Georgia | 48.58 | |
| 7 | José Antonio Flores | Mexico | 49.36 | |
| 8 | Isoa Me | Fiji | 49.40 | |
| 9 | Wong Man Hou | Macau | 54.57 | |

#### Heat 7

| Rank | Name | Nationality | Time | Notes |
| 1 | Kurt Mulcahy | Australia | 47.35 | Q |
| 2 | Nigel Levine | United Kingdom | 47.38 | Q |
| 3 | Zwede Hewitt | Trinidad and Tobago | 47.45 | Q |
| 4 | Mauritz Kåshagen | Norway | 47.75 | q |
| 5 | Bereket Desta | Ethiopia | 47.80 | |
| 6 | Akihiro Urano | Japan | 48.07 | |
| 7 | Arnaud Froidmont | Belgium | 48.47 | |
| 8 | Fabian Norgrove | Barbados | 49.10 | |

## Participation

According to an unofficial count, 58 athletes from 42 countries participated in the event.
* Australia (1)
* Bahamas (2)
* Barbados (1)
* Belgium (1)
* Canada (1)
* Comoros (1)
* Czech Republic (1)
* Denmark (1)
* Dominica (1)
* Ethiopia (1)
* Fiji (1)
* France (2)
* Georgia (1)
* Germany (2)
* Greece (1)
* Grenada (2)
* Hungary (2)
* Ireland (1)
* Italy (2)
* Jamaica (2)
* Japan (2)
* Kenya (1)
* Latvia (1)
* Macau (1)
* Mexico (1)
* Montserrat (1)
* Netherlands Antilles (1)
* Nigeria (2)
* Norway (1)
* Poland (2)
* Puerto Rico (1)
* Russia (1)
* Saudi Arabia (2)
* Slovakia (1)
* Slovenia (1)
* Spain (2)
* Sudan (1)
* Trinidad and Tobago (2)
* Ukraine (2)
* United Kingdom (2)
* United States (2)
* Yemen (1)