Heats

Qualification: First 3 in each heat (Q) and the next 3 fastest (q) advance to the semifinals.

Rank	Heat	Name	Nationality	Time	Notes
1	1	Chris Brown	Bahamas	44.50	Q, SB
2	4	LaShawn Merritt	United States	44.78	Q
3	1	John Steffensen	Australia	44.82	Q, SB
4	1	Arismendy Peguero	Dominican Republic	44.92	Q, PB
5	4	Johan Wissman	Sweden	44.94	Q, NR
6	3	Alleyne Francique	Grenada	44.95	Q, SB
7	6	Nery Brenes	Costa Rica	45.01	Q, NR
8	2	Jeremy Wariner	United States	45.10	Q
9	6	Angelo Taylor	United States	45.13	Q
10	7	Tyler Christopher	Canada	45.15	Q
11	3	Leslie Djhone	France	45.17	Q
12	5	Gary Kikaya	Democratic Republic of the Congo	45.21	Q
13	7	Ato Modibo	Trinidad and Tobago	45.22	Q, SB
14	2	Avard Moncur	Bahamas	45.27	Q
15	5	Sanjay Ayre	Jamaica	45.28	Q
16	6	William Collazo	Cuba	45.29	Q, PB
17	4	Andrae Williams	Bahamas	45.31	Q
18	3	Ricardo Chambers	Jamaica	45.34	Q
19	2	David Gillick	Ireland	45.35	Q
20	6	California Molefe	Botswana	45.36	q, SB
21	7	Sean Wroe	Australia	45.39	Q
22	4	Young Talkmore Nyongani	Zimbabwe	45.40	q, SB
23	5	Timothy Benjamin	Great Britain	45.44	Q
23	6	Michael Blackwood	Jamaica	45.44	q
23	1	Bastian Swillims	Germany	45.44	PB
26	5	Chris Lloyd	Dominica	45.46
27	2	Martyn Rooney	Great Britain	45.47	SB
28	2	Lewis Banda	Zimbabwe	45.47	SB
29	7	Daniel Dąbrowski	Poland	45.50
30	3	Andrew Steele	Great Britain	45.54
31	5	Vladislav Frolov	Russia	45.69
32	1	Renny Quow	Trinidad and Tobago	45.70
33	7	Andrea Barberi	Italy	45.74	SB
34	1	Marcin Marciniszyn	Poland	45.83
35	3	Rafał Wieruszewski	Poland	45.94	SB
36	3	Carlos Santa	Dominican Republic	45.99	SB
37	2	Brice Panel	France	46.02
38	3	Clemens Zeller	Austria	46.06
39	1	Dimitrios Regas	Greece	46.22	SB
40	6	Yuki Yamaguchi	Japan	46.28
41	4	Eric Milazar	Mauritius	46.55
42	5	Ioan Vieru	Romania	46.78
43	4	Andrés Silva	Uruguay	46.79
44	2	Félix Martínez	Puerto Rico	46.86
45	1	Takeshi Fujiwara	El Salvador	46.92	NR
46	7	Dimitrios Gravalos	Greece	46.94
47	5	Mathieu Gnanligo	Benin	47.51
48	6	Jonathon Lavers	Gibraltar	47.97	NR
49	6	Ivano Bucci	San Marino	48.07	PB
50	5	Nicolau Palanca	Angola	48.60
51	4	Dalibor Spasovski	Macedonia	48.63	PB
52	7	Moses Kamut	Vanuatu	48.90
53	4	Karar A.M. Al Abbody	Iraq	48.95	PB
54	2	Abdulla Mohamed Hussein	Somalia	50.54	PB
55	2	Hermán López	Nicaragua	50.72
	3	Yuzo Kanemaru	Japan		DNF
	6	Nagmeldin Ali Abubakr	Sudan		DNF
	7	Lionel Larry	United States		DNF
	4	Gakologelwang Masheto	Botswana		DNS
	5	Hamdan Al-Bishi	Saudi Arabia		DNS

Semifinals

First 2 in each semifinal (Q) and the next 2 fastest (q) advance to the final.

Rank	Heat	Name	Nationality	Time	Notes
1	3	LaShawn Merritt	United States	44.31	Q
2	2	Jeremy Wariner	United States	44.33	Q
3	1	Angelo Taylor	United States	44.45	Q
4	3	Leslie Djhone	France	44.46	Q, NR
5	3	Tyler Christopher	Canada	44.47	q, SB
6	2	Chris Brown	Bahamas	44.50	Q
7	1	Johan Wissman	Sweden	44.56	Q, NR
8	1	Avard Moncur	Bahamas	44.86	q, SB
9	3	John Steffensen	Australia	44.95
10	2	Ato Modibo	Trinidad and Tobago	45.12	SB
11	1	Nery Brenes	Costa Rica	45.14
11	2	Gary Kikaya	Democratic Republic of the Congo	45.14
13	2	Ricardo Chambers	Jamaica	45.18
14	1	Sean Wroe	Australia	45.25	PB
15	2	David Gillick	Ireland	45.37
16	3	Andrae Williams	Bahamas	45.40
17	1	Alleyne Francique	Grenada	45.41
18	2	California Molefe	Botswana	45.47
19	1	Arismendy Peguero	Dominican Republic	45.54
19	2	William Collazo	Cuba	45.54
21	1	Michael Blackwood	Jamaica	45.60
22	3	Timothy Benjamin	Great Britain	46.17
23	3	Young Talkmore Nyongani	Zimbabwe	46.23
	3	Sanjay Ayre	Jamaica		DNF

Final

Rank	Name	Nationality	Time	Notes
	Jeremy Wariner	United States	43.45	WL
	LaShawn Merritt	United States	43.96	PB
	Angelo Taylor	United States	44.32
4	Chris Brown	Bahamas	44.45	NR
5	Leslie Djhone	France	44.59
6	Tyler Christopher	Canada	44.71
7	Johan Wissman	Sweden	44.72
8	Avard Moncur	Bahamas	45.40