400 Metres Result | 15th IAAF World Championships

First 2 in each heat (Q) and the next 2 fastest (q)

POS	BIB	ATHLETE	COUNTRY	MARK	Reaction Time
1	142	Shaunae Miller-Uibo	BAH	50.12 Q	0.167
2	509	Christine Day	JAM	50.82 Q	0.216
3	489	Libania Grenot	ITA	51.14	0.175
4	366	Floria Guei	FRA	51.30	0.188
5	889	Natasha Hastings	USA	51.33	0.154
6	725	Nadezhda Kotlyarova	RUS	51.86	0.184
7	112	Anneliese Rubie-Renshaw	AUS	52.04	0.180
	578	Joy Nakhumicha Sakari	KEN	DQ

POS	BIB	ATHLETE	COUNTRY	MARK	Reaction Time
1	390	Christine Ohuruogu	GBR	50.16 Q SB	0.170
2	515	Stephenie Ann McPherson	JAM	50.32 Q SB	0.135
3	881	Phyllis Francis	USA	50.50 q SB	0.189
4	630	Patience Okon George	NGR	50.76 PB	0.252
5	367	Marie Gayot	FRA	50.97 PB	0.213
6	736	Ekaterina Renzhina	RUS	51.49 PB	0.158
7	678	Patrycja Wyciszkiewicz-Zawadzka	POL	51.94	0.153
8	205	Carline Muir	CAN	52.31	0.228

POS	BIB	ATHLETE	COUNTRY	MARK	Reaction Time
1	879	Allyson Felix	USA	49.89 Q SB	0.154
2	512	Shericka Jackson	JAM	50.03 Q PB	0.187
3	513	Novlene Williams-Mills	JAM	50.47 q SB	0.204
4	843	Nataliia Pygyda	UKR	50.62 PB	0.176
5	389	Anyika Onuora	GBR	50.87 PB	0.175
6	698	Bianca Razor	ROU	51.05	0.167
7	571	Maureen Jelagat Maiyo	KEN	51.92	0.182
8	944	Kabange Mupopo	ZAM	51.93	0.178