# 2018 IAAF World U20 Championships – Men's 400 metres hurdles

The men's 400 metres hurdles at the 2018 IAAF World U20 Championships was held at Ratina Stadium on 12, 13 and 14 July.

## Records

Standing records prior to the 2021 World Athletics U20 Championships :
| World U20 Record | Danny Harris (USA) | 48.02 | Los Angeles, United States | 17 June 1984 |
| Championship Record | Kerron Clement (USA) | 48.51 | Grosseto, Italy | 16 July 2004 |
| World U20 Leading | Sokwakhana Zanini (RSA) | 49.32 | Pretoria, South Africa | 17 March 2018 |

## Results
### Heats

Qualification: First 3 of each heat (Q) and the 6 fastest times (q) qualified for the semifinals.
| Rank | Heat | Name | Nationality | Time | Note |
| 1 | 4 | Moitalel Mpoke Naadokila | Kenya | 50.87 | Q, PB |
| 2 | 3 | Rasheeme Griffith | Barbados | 51.02 | Q, SB |
| 3 | 4 | Alison dos Santos | Brazil | 51.08 | Q |
| 4 | 2 | Alastair Chalmers | United Kingdom | 51.16 | Q |
| 5 | 5 | Sokwakhana Zazini | South Africa | 51.21 | Q |
| 6 | 5 | Alex Knibbs | United Kingdom | 51.29 | Q |
| 7 | 4 | Carl Bengtström | Sweden | 51.35 | Q |
| 8 | 4 | Ierotheos Dritsas | Greece | 51.39 | q, PB |
| 9 | 6 | Malik James-King | Jamaica | 51.54 | Q |
| 10 | 2 | Alessandro Sibilio | Italy | 51.59 | Q SB |
| 11 | 2 | Julien Bonvin | Switzerland | 51.64 | Q, PB |
| 12 | 3 | Leonardo Ledgister | Jamaica | 51.65 | Q |
| 13 | 3 | Quivell Jordan | United States | 51.75 | Q |
| 14 | 3 | Aleix Porras | Spain | 51.83 | q |
| 15 | 2 | Ramsey Angela | Netherlands | 51.95 | q |
| 16 | 4 | Nathan Fergusson | Barbados | 52.02 | q, PB |
| 17 | 6 | Yusuke Shirao | Japan | 52.09 | Q |
| 18 | 1 | Cory Poole | United States | 52.12 | Q |
| 19 | 5 | Jesús David Delgado | Spain | 52.13 | Q |
| 20 | 4 | Mahdi Pirjahan | Iran | 52.18 | q |
| 21 | 3 | Ismail Manyani | Morocco | 52.24 | q |
| 22 | 1 | Bassem Hemeida | Qatar | 52.35 | Q |
| 23 | 1 | Lourens Steenekamp | South Africa | 52.35 | Q |
| 24 | 6 | Boaz Madeus | Haiti | 52.38 | Q |
| 25 | 1 | Hayata Goto | Japan | 52.48 | |
| 26 | 5 | Gadisa Bayu | Ethiopia | 52.59 | |
| 27 | 6 | Samuele Licata | Italy | 52.60 | |
| 28 | 5 | Emil Agyekum | Germany | 52.70 | |
| 29 | 1 | Karl Erik Nazarov | Estonia | 52.80 | |
| 30 | 6 | Fu Jiahao | China | 52.82 | PB |
| 31 | 2 | James Mucheru | Kenya | 52.88 | |
| 32 | 3 | Harvey Murrant | Australia | 53.02 | |
| 33 | 2 | Dániel Huller | Hungary | 53.13 | |
| 34 | 3 | Vesa Kittilä | Finland | 53.21 | PB |
| 35 | 5 | Damián Moretta | Argentina | 53.43 | |
| 36 | 5 | Fahd Benammar | Tunisia | 53.71 | |
| 37 | 4 | Nathaniel St. Romain | Canada | 53.85 | |
| 38 | 1 | Anton Bertilsson | Sweden | 54.82 | |
| 39 | 1 | Branson Rolle | Bahamas | 1:08.85 | |
| | 2 | Sergio Armando Esquivel | Mexico | DNF |
| | 6 | Norman Mukwada | Zimbabwe | DQ | |
| | 6 | Justus Ringel | Germany | DQ | |

### Semifinals

Qualification: First 2 of each heat (Q) and the 2 fastest times (q) qualified for the final.
| Rank | Heat | Name | Nationality | Time | Note |
| 1 | 3 | Sokwakhana Zazini | South Africa | 49.43 | Q |
| 2 | 3 | Alastair Chalmers | United Kingdom | 50.11 | Q, NJR |
| 3 | 3 | Leonardo Ledgister | Jamaica | 50.13 | q, PB |
| 4 | 2 | Malik James-King | Jamaica | 50.34 | Q |
| 5 | 3 | Alessandro Sibilio | Italy | 50.73 | q, SB |
| 6 | 3 | Quivell Jordan | United States | 50.86 | |
| 7 | 1 | Alison dos Santos | Brazil | 50.90 | Q |
| 8 | 2 | Mahdi Pirjahan | Iran | 50.98 | Q, NJR |
| 9 | 2 | Alex Knibbs | United Kingdom | 50.99 | |
| 10 | 2 | Rasheeme Griffith | Barbados | 51.02 | SB |
| 11 | 1 | Bassem Hemeida | Qatar | 51.14 | Q |
| 12 | 2 | Yusuke Shirao | Japan | 51.21 | |
| 13 | 2 | Lourens Steenekamp | South Africa | 51.26 | |
| 14 | 1 | Cory Poole | United States | 51.27 | |
| 15 | 1 | Carl Bengtström | Sweden | 51.55 | |
| 16 | 2 | Julien Bonvin | Switzerland | 51.83 | |
| 17 | 1 | Moitalel Mpoke Naadokila | Kenya | 51.94 | |
| 18 | 3 | Ramsey Angela | Netherlands | 51.99 | |
| 19 | 3 | Jesús David Delgado | Spain | 52.18 | |
| 20 | 1 | Ierotheos Dritsas | Greece | 52.38 | |
| 21 | 1 | Boaz Madeus | Haiti | 54.45 | |
| 22 | 3 | Nathan Fergusson | Barbados | 54.58 | |
| | 1 | Ismail Manyani | Morocco | DQ | |
| | 2 | Aleix Porras | Spain | DNS | |

### Final

| Rank | Lane | Name | Nationality | Time | Note |
| | 4 | Sokwakhana Zazini | South Africa | 49.42 | |
| | 7 | Bassem Hemeida | Qatar | 49.59 | PB |
| | 6 | Alison dos Santos | Brazil | 49.78 | PB |
| 4 | 2 | Leonardo Ledgister | Jamaica | 49.93 | PB |
| 5 | 3 | Malik James-King | Jamaica | 50.25 | |
| 6 | 5 | Alastair Chalmers | United Kingdom | 50.27 | |
| 7 | 8 | Mahdi Pirjahan | Iran | 51.15 | |
| 8 | 1 | Alessandro Sibilio | Italy | 52.38 | |