400m hurdles (84.0cm) 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	437	Sokwakhana Zazini	RSA	49.63 Q
2	1	1	320	Rovane Williams	JAM	51.94 Q PB
3	2	1	337	Moitalel Mpoke Naadokila	KEN	52.40 Q PB
4	1	3	150	Alison dos Santos	BRA	52.95 Q
5	2	3	247	Fabien Laroppe	FRA	53.06 Q PB
6	3	1	176	Daojun Wang	CHN	53.21 q
7	4	1	528	Baptiste Christophe	FRA	53.24 q
8	2	2	401	Luis Elespuru	PER	53.57 Q
9	3	2	469	Ting Hsuan Huang	TPE	53.74
10	3	3	162	Chenggui Ding	CHN	54.02
11	5	1	455	Tihomir Djordjevic	SRB	54.30
12	4	2	445	Jahnaza Francis	SKN	54.67
13	6	1	108	Ayoub Mahrou	ALG	54.83
14	4	3	107	Yacine Khedim	ALG	54.87
15	5	3	511	Andriy Vasylevskyy	UKR	55.10
16	5	2	373	Ruslem Zikry Putra Roseli	MAS	55.46
17	6	3	365	Ismail Manyani	MAR	55.62
18	6	2	364	Oussama Hammi	MAR	55.80
19	7	2	352	Aleksandrs Kucs	LAT	56.22
20	7	1	131	Matthew Thomspon	BAH	57.78
21	8	1	283	Halomoan Edwin Binsar	INA	1:08.62
		3	341	David Kisoto Saruni	KEN	DQ
		3	206	Filip Ličman	CZE	DNS

400m hurdles (84.0cm) Boys