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

Women
400 m
1	48.83			Sanya Richards-Ross	USA	26 Feb 85	173/61	1	VD	Bruxelles	4 Sep
2	49.29	NUR		Antonina Krivoshapka	RUS	21 Jul 87		1s1	NC	Cheboksary	23 Jul
3	49.32			Shericka Williams	JAM	17 Sep 85	170/64	2	WC	Berlin	18 Aug
4	49.77			Novlene Williams-Mills	JAM	26 Apr 82	167/55	4	WC	Berlin	18 Aug
5	49.83			Allyson Felix	USA	18 Nov 85	168/57	2	WK	Zürich	28 Aug
6	49.89			Amantle Montsho	BOT	4 Jul 83		2s1	WC	Berlin	16 Aug
7	49.95			Debbie Dunn	USA	26 Mar 78		3s2	WC	Berlin	16 Aug
8	49.97			Anastasiya Kapachinskaya	RUS	21 Nov 79	173/59	2	NC	Cheboksary	24 Jul
9	50.21			Christine Ohuruogu	GBR	17 May 84	175/70	5	WC	Berlin	18 Aug
10	50.27			Lyudmila Litvinova	RUS	8 Jun 85		3	NC	Cheboksary	24 Jul
11	50.30	NR		Libania Grenot	ITA	12 Jul 83	175/65	1	MedG	Pescara	2 Jul
12	50.39			Joanna Atkins	USA	31 Jan 89		1	NCAA	Fayetteville AR	13 Jun
13	50.39			Monica Hargrove	USA	30 Dec 82		2	Tsiklitiria	Athína	13 Jul
14	50.45			Nicola Sanders	GBR	23 Jun 82	172/60	4s2	WC	Berlin	16 Aug
15	50.56			Jessica Beard	USA	8 Jan 89		2	NCAA	Fayetteville AR	13 Jun
16	50.56			Natalya Nazarova	RUS	22 May 79	166/56	4	NC	Cheboksary	24 Jul
17	50.58			Francena McCorory	USA	20 Oct 88		3	NCAA	Fayetteville AR	13 Jun
18	50.59			Tatyana Firova	RUS	10 Oct 82	174/59	2s2	NC	Cheboksary	23 Jul
19	50.71			Ami Mbacké Thiam	SEN	10 Nov 76	183/70	3	GGala	Roma	10 Jul
20	50.71	NR		Aliann Pompey	GUY	9 Mar 78	165/55	4s1	WC	Berlin	16 Aug