| 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.
| 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.
Prior to the competition, the following records were as follows.
| World Youth Best |  | 45.14 | Santiago de Chile, Chile | 2 September 1995 |
| Championship Record |  | 45.24 | Bressanone, Italy | 10 July 2009 |
| World Youth Leading | | 45.38 | Albuquerque, New Mexico, United States | 3 June 2017 |
Qualification rule: first 4 of each heat (Q) and the next 4 fastest qualified. [1]
| Rank | Name | Nationality | Reaction | Time | Notes |
|---|---|---|---|---|---|
| 1 | Colby Jennings |  | 0.224 | 47.36 | Q, PB |
| 2 | Melkamu Assefa |  | 0.214 | 47.43 | Q |
| 3 | Kelvin Sawe Tauta |  | 0.370 | 47.55 | |
| 4 | Elvin Josué Canales |  | 0.243 | 48.21 | |
| 5 | Thiruben Thana Rajan |  | 0.171 | 48.40 | |
| 6 | Musa Isah |  | 0.187 | 48.43 | |
| 7 | Xu Bo |  | 0.226 | 48.90 | |
| 8 | Bernard Olesitse |  | 0.161 | 50.54 |
| Rank | Name | Nationality | Reaction | Time | Notes |
|---|---|---|---|---|---|
| 1 | Anthony Cox |  | 0.266 | 46.86 | Q |
| 2 | Ivan Danny Geldenhuys |  | 0.181 | 47.24 | Q, PB |
| 3 | Daniel Williams |  | 0.186 | 47.46 | q |
| 4 | David Sanayek | | 0.199 | 47.66 | |
| 5 | Mohammad Jahir Rayhan |  | 0.198 | 48.22 | |
| 6 | José Álvarez |  | 0.160 | 48.79 | |
| 7 | Deng Hantao | | 0.185 | 49.12 | |
| 8 | Tyrell Simms |  | 0.167 | 49.38 |
| Rank | Name | Nationality | Reaction | Time | Notes |
|---|---|---|---|---|---|
| 1 | Bruno Benedito da Silva |  | 0.215 | 46.87 | Q, PB |
| 2 | Antonio Watson | | 0.000 | 47.05 | Q, PB |
| 3 | Gregor Grahovac |  | 0.183 | 47.34 | q, PB |
| 4 | Yaroslav Demchenko |  | 0.178 | 47.96 | PB |
| 5 | Reuben Nichols |  | 0.215 | 48.01 | PB |
| 6 | Correy Sherrod | | 0.211 | 48.56 | |
| 7 | Thiran Kalavitigoda Pathirannahalage |  | 0.188 | 48.89 | |
| – | Antonio Grant |  | N/A | N/A | DQ |
| Rank | Name | Nationality | Reaction | Time | Notes |
|---|---|---|---|---|---|
 | Antonio Watson | | 0.174 | 46.59 | PB |
 | Daniel Williams | | 0.200 | 46.72 | PB |
 | Colby Jennings | | 0.213 | 46.77 | PB |
| 4 | Anthony Cox | | 0.210 | 46.77 | |
| 5 | Melkamu Assefa | | 0.249 | 47.05 | |
| 6 | Bruno Benedito da Silva | | 0.231 | 47.15 | |
| 7 | Ivan Danny Geldenhuys | | 0.192 | 47.17 | PB |
| 8 | Gregor Grahovac | | 0.157 | 48.88 |
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