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2009  World  Top 20 Compiled by Mirko Jalava, Tilastopaja Oy. Text version here.

Men
400 m
1	44.06			LaShawn Merritt	USA	27 Jun 86	188/82	1	WC	Berlin	21 Aug
2	44.53			Rennie Quow	TRI	25 Aug 87	170/66	2s2	WC	Berlin	19 Aug
3	44.60			Jeremy Wariner	USA	31 Jan 84	188/67	2	WC	Berlin	21 Aug
4	44.73			Latoy Williams	BAH	28 May 88	190/77	1	JUCO	Hutchinson KS	23 May
5	44.74			Michael Bingham	GBR	13 Apr 86	186/79	2s1	WC	Berlin	19 Aug
6	44.77	NR		Tabarie Henry	ISV	1 Dec 87	185/75	2	JUCO	Hutchinson KS	23 May
7	44.77	NR		David Gillick	IRL	9 Jul 83	195/85	1	Madrid 2009	Madrid	4 Jul
8	44.78	NR		Jonathan Borlée	BEL	22 Feb 88	180/67	1	NCAA	Fayetteville AR	13 Jun
9	44.80			Leslie Djhone	FRA	18 Mar 81	187/73	3s1	WC	Berlin	19 Aug
10	44.81			Chris Brown	BAH	15 Oct 78	178/68	1	GGala	Roma	10 Jul
11	44.86			Gil Roberts	USA	15 Mar 89	183/75	1	Big 12	Lubbock TX	17 May
12	44.93			William Collazo	CUB	31 Aug 86	172/68	3s2	WC	Berlin	19 Aug
13	44.96			Calvin Smith	USA	10 Dec 87	180/75	1	SEC	Gainesville FL	17 May
14	44.98			Andrae Williams	BAH	11 Jul 83	185/82	1r1	TT Open	Lubbock TX	7 May
15	44.98			Dwight Mullings	JAM	10 Dec 86	178/74	2	SEC	Gainesville FL	17 May
16	44.99			Ramon Miller	BAH	17 Feb 87	180/73	5s1	WC	Berlin	19 Aug
17	45.07			Sean Wroe	AUS	18 Mar 85	185/75	1	NC	Brisbane	20 Mar
18	45.08			Kerron Clement	USA	31 Oct 85	188/84	1s1	NC	Eugene OR	26 Jun
19	45.13			Ricardo Chambers	JAM	7 Oct 84	177/73	3s3	WC	Berlin	19 Aug
20	45.14			David Neville	USA	1 Jun 84	190/73	2	Tsiklitiria	Athína	13 Jul