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

Women
400 m hurdles
1	52.42	AR		Melaine Walker	JAM	1 Jan 83	165/53	1	WC	Berlin	20 Aug
2	52.63			Lashinda Demus	USA	10 Mar 83	170/57	1	Herc	Monaco	28 Jul
3	53.20	NR		Josanne Lucas	TRI	14 May 84		3	WC	Berlin	20 Aug
4	53.56			Kaliese Spencer	JAM	6 May 87		4	WC	Berlin	20 Aug
5	53.83			Tiffany Williams	USA	5 Feb 83	160/57	5	WC	Berlin	20 Aug
6	53.95			Angela Moroşanu	ROU	26 Jul 86	178/57	1	NC	Bucureşti	2 Aug
7	54.11			Natalya Antyukh	RUS	26 Jun 81	175/64	6	WC	Berlin	20 Aug
8	54.19			Sheena Tosta	USA	1 Oct 82	165/57	1	SAmGP	Belém	24 May
9	54.31			Anna Jesień	POL	10 Dec 78	168/56	1	GGala	Roma	10 Jul
10	54.49			Anastasiya Rabchenyuk	UKR	14 Sep 83	172/55	2s2	WC	Berlin	18 Aug
11	54.80	NR		Joke Odumosu	NGR	27 Oct 87	168/59	1	NC	Abuja	25 Jul
12	54.86			Yuliya Pechonkina	RUS	21 Apr 78	176/66	1	NC	Cheboksary	24 Jul
13	54.89			Nickiesha Wilson	JAM	28 Jul 86		3s3	WC	Berlin	18 Aug
14	54.90	NR		Zuzana Hejnová	CZE	19 Dec 86	170/54	7	Herc	Monaco	28 Jul
15	55.14			Vania Stambolova	BUL	28 Nov 83	175/53	1	WUG	Beograd	9 Jul
16	55.19			Tasha Danvers	GBR	19 Sep 77	175/63	1rA	Reebok	New York NY	30 May
17	55.26			Perri Shakes-Drayton	GBR	21 Dec 88		1-22	EJ	Kaunas	18 Jul
18	55.32			Eilidh Child	GBR	20 Feb 87		2-22	EJ	Kaunas	18 Jul
19	55.34			Jana Rawlinson	AUS	9 Nov 82	181/68	2rA	Spitzen	Luzern	15 Jul
20	55.39			Nicole Leach	USA	18 Jul 87		1	NCAA	Fayetteville AR	12 Jun