2010 World Junior Championships in Athletics – Men's 400 metres explained

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.

Medalists

Gold	Kirani James
Silver	Marcell Deák Nagy
Bronze	Errol Nolan

Results

Final

22 July

Rank	Name	Nationality	Time	Notes
	align=left		align=left		45.89
	align=left		align=left		46.09
	align=left		align=left		46.36
4	align=left		align=left		46.79
5	align=left		align=left		46.84
6	align=left		align=left		46.90
7	align=left		align=left		47.38
8	align=left		align=left		48.07

Semifinals

21 July

Semifinal 1

Rank	Name	Nationality	Time	Notes
1	align=left		align=left		46.23	Q
2	align=left		align=left		46.47	Q
3	align=left		align=left		47.02	q
4	align=left		align=left		47.25
5	align=left		align=left		47.43
6	align=left		align=left		47.98
7	align=left		align=left		48.08
8	align=left		align=left		48.55

Semifinal 2

Rank	Name	Nationality	Time	Notes
1	align=left		align=left		46.27	Q
2	align=left		align=left		46.40	Q
3	align=left		align=left		46.54	q
4	align=left		align=left		47.09
5	align=left		align=left		47.47
6	align=left		align=left		47.61
7	align=left		align=left		48.31
	align=left		align=left		DQ	IAAF rule 163.3

Semifinal 3

Rank	Name	Nationality	Time	Notes
1	align=left		align=left		46.43	Q
2	align=left		align=left		46.83	Q
3	align=left		align=left		47.09
4	align=left		align=left		47.23
5	align=left		align=left		47.49
6	align=left		align=left		47.65
7	align=left		align=left		47.86
8	align=left		align=left		48.01

Heats

20 July

Heat 1

Rank	Name	Nationality	Time	Notes
1	align=left		align=left		46.75	Q
2	align=left		align=left		47.38	Q
3	align=left		align=left		47.50	Q
4	align=left		align=left		47.50	q
5	align=left		align=left		47.62	q
6	align=left		align=left		47.90	q
7	align=left		align=left		48.97
	align=left		align=left		DQ	IAAF rule 163.3

Heat 2

Rank	Name	Nationality	Time	Notes
1	align=left		align=left		47.06	Q
2	align=left		align=left		47.16	Q
3	align=left		align=left		47.46	Q
4	align=left		align=left		47.70	q
5	align=left		align=left		48.07
6	align=left		align=left		48.10
7	align=left		align=left		48.68
8	align=left		align=left		50.48

Heat 3

Rank	Name	Nationality	Time	Notes
1	align=left		align=left		47.31	Q
2	align=left		align=left		47.36	Q
3	align=left		align=left		47.59	Q
4	align=left		align=left		47.97
5	align=left		align=left		48.02
6	align=left		align=left		50.18
7	align=left		align=left		51.65

Heat 4

Rank	Name	Nationality	Time	Notes
1	align=left		align=left		47.29	Q
2	align=left		align=left		47.46	Q
3	align=left		align=left		47.48	Q
4	align=left		align=left		47.92
5	align=left		align=left		48.34
6	align=left		align=left		48.85
7	align=left		align=left		49.84

Heat 5

Rank	Name	Nationality	Time	Notes
1	align=left		align=left		47.12	Q
2	align=left		align=left		47.28	Q
3	align=left		align=left		47.33	Q
4	align=left		align=left		47.75	q
5	align=left		align=left		48.99
6	align=left		align=left		49.81
7	align=left		align=left		50.62

Heat 6

Rank	Name	Nationality	Time	Notes
1	align=left		align=left		46.67	Q
2	align=left		align=left		47.22	Q
3	align=left		align=left		47.28	Q
4	align=left		align=left		47.54	q
5	align=left		align=left		48.54
6	align=left		align=left		48.63
	align=left		align=left		DQ	IAAF rule 163.3

Participation

According to an unofficial count, 44 athletes from 31 countries participated in the event.