The men's 400 metres event at the 2010 World Junior Championships in Athletics was held in Moncton, New Brunswick, Canada, at Moncton Stadium on 20, 21 and 22 July. [1] [2]
| Gold | Kirani James |
| Silver | Marcell Deák Nagy |
| Bronze | Errol Nolan |
22 July
| Rank | Name | Nationality | Time | Notes |
|---|---|---|---|---|
| Kirani James | 45.89 | |||
| Marcell Deák Nagy | 46.09 | |||
| Errol Nolan | 46.36 | |||
| 4 | Marco Kaiser | 46.79 | ||
| 5 | Josh Mance | 46.84 | ||
| 6 | Luguelín Santos | 46.90 | ||
| 7 | Alistair Moona | 47.38 | ||
| 8 | Pako Seribe | 48.07 |
21 July
| Rank | Name | Nationality | Time | Notes |
|---|---|---|---|---|
| 1 | Marcell Deák Nagy | 46.23 | Q | |
| 2 | Errol Nolan | 46.47 | Q | |
| 3 | Pako Seribe | 47.02 | q | |
| 4 | Omar Longart | 47.25 | ||
| 5 | Tobi Ogunmola | 47.43 | ||
| 6 | Jacques de Swardt | 47.98 | ||
| 7 | Jonathan Vilaine | 48.08 | ||
| 8 | Awad El-Karim Makki | 48.55 |
| Rank | Name | Nationality | Time | Notes |
|---|---|---|---|---|
| 1 | Kirani James | 46.27 | Q | |
| 2 | Marco Kaiser | 46.40 | Q | |
| 3 | Luguelín Santos | 46.54 | q | |
| 4 | Isah Salihu | 47.09 | ||
| 5 | Shaun De Jager | 47.47 | ||
| 6 | Halit Kiliç | 47.61 | ||
| 7 | Mohamed Abou El-Khair | 48.31 | ||
| Park Bong-Go | DQ | IAAF rule 163.3 |
| Rank | Name | Nationality | Time | Notes |
|---|---|---|---|---|
| 1 | Josh Mance | 46.43 | Q | |
| 2 | Alistair Moona | 46.83 | Q | |
| 3 | Mateusz Fórmanski | 47.09 | ||
| 4 | Thapelo Ketlogetswe | 47.23 | ||
| 5 | Deon Lendore | 47.49 | ||
| 6 | Alex Jordan | 47.65 | ||
| 7 | Philipp Kleemann | 47.86 | ||
| 8 | Demar Murray | 48.01 |
20 July
| Rank | Name | Nationality | Time | Notes |
|---|---|---|---|---|
| 1 | Mateusz Fórmanski | 46.75 | Q | |
| 2 | Omar Longart | 47.38 | Q | |
| 3 | Alex Jordan | 47.50 | Q | |
| 4 | Jacques de Swardt | 47.50 | q | |
| 5 | Demar Murray | 47.62 | q | |
| 6 | Philipp Kleemann | 47.90 | q | |
| 7 | Ratutira Narara | 48.97 | ||
| Mitchel Davis | DQ | IAAF rule 163.3 |
| Rank | Name | Nationality | Time | Notes |
|---|---|---|---|---|
| 1 | Marco Kaiser | 47.06 | Q | |
| 2 | Pako Seribe | 47.16 | Q | |
| 3 | Park Bong-Go | 47.46 | Q | |
| 4 | Mohamed Abou El-Khair | 47.70 | q | |
| 5 | Mehmet Güzel | 48.07 | ||
| 6 | Jermaine Gayle | 48.10 | ||
| 7 | Golden Gunde | 48.68 | ||
| 8 | Mahamoud Athoumani | 50.48 |
| Rank | Name | Nationality | Time | Notes |
|---|---|---|---|---|
| 1 | Marcell Deák Nagy | 47.31 | Q | |
| 2 | Luguelín Santos | 47.36 | Q | |
| 3 | Awad El-Karim Makki | 47.59 | Q | |
| 4 | Lim Chan-Ho | 47.97 | ||
| 5 | Uroš Jovanovic | 48.02 | ||
| 6 | Jocelyn Muntaner | 50.18 | ||
| 7 | Michael Rasmijn | 51.65 |
| Rank | Name | Nationality | Time | Notes |
|---|---|---|---|---|
| 1 | Josh Mance | 47.29 | Q | |
| 2 | Thapelo Ketlogetswe | 47.46 | Q | |
| 3 | Shaun De Jager | 47.48 | Q | |
| 4 | Keitaro Sato | 47.92 | ||
| 5 | Tremaine Harris | 48.34 | ||
| 6 | Boniface Mucheru Tumuti | 48.85 | ||
| 7 | Momodou Kujabi | 49.84 |
| Rank | Name | Nationality | Time | Notes |
|---|---|---|---|---|
| 1 | Kirani James | 47.12 | Q | |
| 2 | Halit Kiliç | 47.28 | Q | |
| 3 | Deon Lendore | 47.33 | Q | |
| 4 | Isah Salihu | 47.75 | q | |
| 5 | Junki Yanagisawa | 48.99 | ||
| 6 | Mohamed Al-Jumaah | 49.81 | ||
| 7 | Stephen Newbold | 50.62 |
| Rank | Name | Nationality | Time | Notes |
|---|---|---|---|---|
| 1 | Errol Nolan | 46.67 | Q | |
| 2 | Alistair Moona | 47.22 | Q | |
| 3 | Tobi Ogunmola | 47.28 | Q | |
| 4 | Jonathan Vilaine | 47.54 | q | |
| 5 | Kishon Dempster | 48.54 | ||
| 6 | Scott Burch | 48.63 | ||
| Benjamin Auka Nyasimi | DQ | IAAF rule 163.3 |
According to an unofficial count, 44 athletes from 31 countries participated in the event.