2017 World Youth Championships in Athletics – Boys' 400 metres
| Boy's 400 metres at the World U18 Championships | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Venue | Moi International Sports Centre | |||||||||
| Dates | 12–14 July 2017 | |||||||||
| Winning time | 46.59 | |||||||||
| Medalists | ||||||||||
| ||||||||||
The Boys' 400 metres at the 2017 World Youth Championships in Athletics was held on 12-14 July.
Records
Prior to the competition, the following records were as follows.
| World Youth Best |  Obea Moore (USA)
|
45.14 | Santiago de Chile, Chile | 2 September 1995 |
| Championship Record |  Kirani James (GRN)
|
45.24 | Bressanone, Italy | 10 July 2009 |
| World Youth Leading | Tyrese Cooper (USA)
|
45.38 | Albuquerque, New Mexico, United States | 3 June 2017 |
Heats
Qualification rule: first 4 of each heat (Q) and the next 4 fastest qualified.[1]
Semifinals
Semifinal 1
| Rank | Name | Nationality | Reaction | Time | Notes |
|---|---|---|---|---|---|
| 1 | Colby Jennings |  Turks and Caicos Islands |
0.224 | 47.36 | Q, PB |
| 2 | Melkamu Assefa |  Ethiopia |
0.214 | 47.43 | Q |
| 3 | Kelvin Sawe Tauta |  Kenya |
0.370 | 47.55 | |
| 4 | Elvin Josué Canales |  Honduras |
0.243 | 48.21 | |
| 5 | Thiruben Thana Rajan |  Singapore |
0.171 | 48.40 | |
| 6 | Musa Isah |  Bahrain |
0.187 | 48.43 | |
| 7 | Xu Bo |  China |
0.226 | 48.90 | |
| 8 | Bernard Olesitse |  Botswana |
0.161 | 50.54 |
Semifinal 2
| Rank | Name | Nationality | Reaction | Time | Notes |
|---|---|---|---|---|---|
| 1 | Anthony Cox |  Jamaica |
0.266 | 46.86 | Q |
| 2 | Ivan Danny Geldenhuys |  Namibia |
0.181 | 47.24 | Q, PB |
| 3 | Daniel Williams |  Guyana |
0.186 | 47.46 | q |
| 4 | David Sanayek | Kenya |
0.199 | 47.66 | |
| 5 | Mohammad Jahir Rayhan |  Bangladesh |
0.198 | 48.22 | |
| 6 | José Álvarez |  Venezuela |
0.160 | 48.79 | |
| 7 | Deng Hantao | China |
0.185 | 49.12 | |
| 8 | Tyrell Simms |  Bahamas |
0.167 | 49.38 |
Semifinal 3
| Rank | Name | Nationality | Reaction | Time | Notes |
|---|---|---|---|---|---|
| 1 | Bruno Benedito da Silva |  Brazil |
0.215 | 46.87 | Q, PB |
| 2 | Antonio Watson | Jamaica |
0.000 | 47.05 | Q, PB |
| 3 | Gregor Grahovac |  Slovenia |
0.183 | 47.34 | q, PB |
| 4 | Yaroslav Demchenko |  Ukraine |
0.178 | 47.96 | PB |
| 5 | Reuben Nichols |  Saint Lucia |
0.215 | 48.01 | PB |
| 6 | Correy Sherrod | Bahamas |
0.211 | 48.56 | |
| 7 | Thiran Kalavitigoda Pathirannahalage |  Sri Lanka |
0.188 | 48.89 | |
| – | Antonio Grant |  Panama |
— | — | DQ |
Final
| Rank | Name | Nationality | Reaction | Time | Notes |
|---|---|---|---|---|---|
 |
Antonio Watson | Jamaica |
0.174 | 46.59 | PB |
 |
Daniel Williams | Guyana |
0.200 | 46.72 | PB |
 |
Colby Jennings | Turks and Caicos Islands |
0.213 | 46.77 | PB |
| 4 | Anthony Cox | Jamaica |
0.210 | 46.77 | |
| 5 | Melkamu Assefa | Ethiopia |
0.249 | 47.05 | |
| 6 | Bruno Benedito da Silva | Brazil |
0.231 | 47.15 | |
| 7 | Ivan Danny Geldenhuys | Namibia |
0.192 | 47.17 | PB |
| 8 | Gregor Grahovac | Slovenia |
0.157 | 48.88 |