400 Metres Summary | IAAF World U18 Championships Nairobi 2017

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

POS	Rank	Heat	BIB	ATHLETE	COUNTRY	RESULTS
1	1	2	311	Anthony Cox	JAM	46.86 Q
2	1	3	148	Bruno Silva	BRA	46.87 Q PB
3	2	3	319	Antonio Watson	JAM	47.05 Q PB
4	2	2	388	Ivan Danny Geldenhuys	NAM	47.24 Q PB
5	3	3	448	Gregor Grahovac	SLO	47.34 q PB
6	1	1	468	Colby Jennings	TKS	47.36 Q PB
7	2	1	226	Melkamu Assefa	ETH	47.43 Q
8	3	2	277	Daniel Williams	GUY	47.46 q
9	3	1	342	Kelvin Sane Tauta	KEN	47.55
10	4	2	340	David Kapirante Sanayek	KEN	47.66
11	4	3	500	Yaroslav Demchenko	UKR	47.96 PB
12	5	3	355	Reuben Nichols	LCA	48.01 PB
13	4	1	282	Elvin Josué Canales	HON	48.21
14	5	2	133	Mohammad Jahir Rayhan	BAN	48.22
15	5	1	442	Thiruben S/O Thana Rajan	SGP	48.40
16	6	1	154	Musa Isah	BRN	48.43
17	6	3	129	Correy Sherrod	BAH	48.56
18	6	2	514	José Álvarez	VEN	48.79
19	7	3	457	Thiran Ravishka	SRI	48.89
20	7	1	179	Bo Xu	CHN	48.90
21	7	2	161	Hantao Deng	CHN	49.12
22	8	2	130	Tyrell Simms	BAH	49.38
23	8	1	146	Bernard Olesitse	BOT	50.54
		3	398	Antonio Grant	PAN	DQ

400 Metres Boys