# 2024 World Athletics U20 Championships – Men's 400 metres

The men's 400 metres at the 2024 World Athletics U20 Championships was held at the Estadio Atlético de la VIDENA in Lima, Peru on 28 and 29 August 2024.

## Records

U20 standing records prior to the 2024 World Athletics U20 Championships were as follows:
| Record | Athlete & Nationality | Mark | Location | Date |
| World U20 Record | Steve Lewis (USA) | 43.87 | Seoul, South Korea | 28 September 1988 |
| Championship Record | Anthony Pesela (BOT) | 44.58 | Nairobi, Kenya | 21 August 2021 |
| World U20 Leading | Quincy Wilson (USA) | 44.20 | Eugene, United States | 19 July 2024 |

## Results
### Heats

The first 3 athletes in each heat (Q) and the next 3 fastest (q) qualified to the semi-finals.

#### Heat 1

| Rank | Lane | Athlete | Nation | Time | Notes |
| 1 | 7 | Jakub Szarapo | Poland | 46.95 | Q |
| 2 | 8 | Sean Doggett | Ireland | 47.31 | Q |
| 3 | 9 | Max Husemann | Germany | 47.38 | Q |
| 4 | 5 | Thabang Monngathipa | Botswana | 47.57 | |
| 5 | 2 | Alexandru Vochin | Romania | 47.64 | |
| 6 | 3 | Muh.Khalil Helmi | Malaysia | 48.19 | |
| – | 6 | Youssouf Djibrine | Qatar | DQ | TR17.2.3 |
| – | 4 | Matas Janarauskas | Lithuania | DQ | TR17.2.3 |

#### Heat 2

| Rank | Lane | Athlete | Nation | Time | Notes |
| 1 | 9 | Terrell Thorne | Australia | 46.44 | Q, PB |
| 2 | 6 | Michał Kijewski | Poland | 47.32 | Q |
| 3 | 2 | Jarell Cruz | Puerto Rico | 47.68 | Q |
| 4 | 8 | Jaylen Bennett | Saint Kitts and Nevis | 47.88 | |
| 5 | 5 | Jabari Matheson | Jamaica | 49.34 | |
| 6 | 4 | Khalid Adoum | Qatar | 49.81 | |
| – | 3 | Dominik Jezernik | Croatia | DNF | |
| – | 7 | David García | Spain | DNS | |

#### Heat 3

| Rank | Lane | Athlete | Nation | Time | Notes |
| 1 | 4 | Sidi Njie | United States | 46.83 | Q |
| 2 | 3 | Walid El Boussiri | Morocco | 46.87 | Q, PB |
| 3 | 8 | Kemarrio Bygrave | Jamaica | 47.39 | Q |
| 4 | 9 | Ryota Oishi | Japan | 47.46 | q |
| 5 | 6 | Victor Chaves | Brazil | 47.52 | |
| 6 | 5 | Aleksandrs Tiščenko | Latvia | 47.98 | |
| 7 | 2 | Jeffrey Cajo | Peru | 48.75 | |
| – | 7 | Bastian Elnan Aurstad | Norway | DNS | |

#### Heat 4

| Rank | Lane | Athlete | Nation | Time | Notes |
| 1 | 5 | Jayden Davis | United States | 46.32 | Q |
| 2 | 7 | Vinícius Galeno | Brazil | 47.55 | Q |
| 3 | 4 | G.W.Jathya Kirulu | Sri Lanka | 47.64 | Q |
| 4 | 3 | Bryan Katoo | South Africa | 48.19 | |
| 5 | 8 | Dragos Nastasa | Romania | 48.20 | |
| 6 | 2 | Joshem Sylvester | Grenada | 48.49 | |
| 7 | 9 | Bapi Hansda | India | 51.26 | |
| 8 | 6 | James Lochauluka | ART | 58.03 | PB |

#### Heat 5

| Rank | Lane | Athlete | Nation | Time | Notes |
| 1 | 8 | Kentaro Shirahata | Japan | 46.45 | Q, PB |
| 2 | 2 | Malachi Austin | Guyana | 46.92 | Q |
| 3 | 9 | Jaden Clement | Trinidad and Tobago | 47.63 | Q |
| 4 | 4 | Francesco De Santis | Italy | 48.07 | |
| 5 | 6 | Pishon Haughton | Canada | 48.15 | |
| 6 | 3 | Neo Ntelele | Lesotho | 50.67 | |
| – | 5 | Caleb Joshua | Nigeria | DQ | TR17.2.3 |
| – | 7 | Ailixier Wumaier | China | DNS | |

#### Heat 6

| Rank | Lane | Athlete | Nation | Time | Notes |
| 1 | 8 | Enerst Kumevu | Botswana | 46.69 | Q |
| 2 | 6 | Árpád Kovács | Hungary | 46.89 | Q |
| 3 | 4 | Jay Kumar | India | 47.08 | Q |
| 4 | 7 | Jett Grundy | Australia | 47.44 | q |
| 5 | 2 | Rafael Buelna | Mexico | 47.82 | |
| 6 | 3 | Kyrell Thomas | Trinidad and Tobago | 48.02 | |
| 7 | 9 | Matthew Galea Soler | Malta | 48.40 | |
| 8 | 5 | Emīls Lamba | Latvia | 48.59 | |

#### Heat 7

| Rank | Lane | Athlete | Nation | Time | Notes |
| 1 | 6 | Udeme Okon | South Africa | 47.03 | Q |
| 2 | 3 | Fu Haoran | China | 47.17 | Q |
| 3 | 5 | Gafari Badmus | Nigeria | 47.24 | Q |
| 4 | 7 | Simone Giliberto | Italy | 47.29 | q, PB |
| 5 | 8 | Alessandro Greco | Austria | 47.68 | |
| 6 | 4 | Ian Pata | Ecuador | 47.84 | |
| 7 | 9 | Zion Miller | Bahamas | DNS | |

### Semi-finals

The first 2 athletes in each heat (Q) and the next 2 fastest (q) qualified to the semi-final.

#### Heat 1

| Rank | Lane | Athlete | Nation | Time | Notes |
| 1 | 8 | Jayden Davis | United States | 45.79 | Q |
| 2 | 7 | Udeme Okon | South Africa | 47.08 | Q |
| 3 | 4 | Vinícius Galeno | Brazil | 47.29 | |
| 4 | 9 | Kemarrio Bygrave | Jamaica | 47.56 | |
| 5 | 6 | Jakub Szarapo | Poland | 47.57 | |
| 6 | 2 | Jett Grundy | Australia | 48.08 | |
| 7 | 5 | Sean Doggett | Ireland | 50.33 | |
| – | 3 | Jaden Clement | Trinidad and Tobago | DNF | |

#### Heat 2

| Rank | Lane | Athlete | Nation | Time | Notes |
| 1 | 8 | Kentaro Shirahata | Japan | 46.30 | Q, PB |
| 2 | 7 | Árpád Kovács | Hungary | 46.70 | Q |
| 3 | 9 | Jay Kumar | India | 46.96 | q, PB |
| 4 | 3 | Jarell Cruz | Puerto Rico | 47.26 | |
| 5 | 4 | Gafari Badmus | Nigeria | 47.43 | |
| 6 | 6 | Enerst Kumevu | Botswana | 47.55 | |
| 7 | 2 | Simone Giliberto | Italy | 47.73 | |
| – | 5 | Malachi Austin | Guyana | DNF | |

#### Heat 3

| Rank | Lane | Athlete | Nation | Time | Notes |
| 1 | 6 | Sidi Njie | United States | 46.56 | Q |
| 2 | 5 | Terrell Thorne | Australia | 46.66 | Q |
| 3 | 7 | Walid El Boussiri | Morocco | 46.73 | q, PB |
| 4 | 3 | G.W.Jathya Kirulu | Sri Lanka | 47.85 | |
| 5 | 2 | Ryota Oishi | Japan | 48.09 | |
| 6 | 4 | Max Husemann | Germany | 48.77 | |
| – | 8 | Fu Haoran | China | DNS | |
| – | 9 | Michał Kijewski | Poland | DNS | |

### Final

| Rank | Lane | Athlete | Nation | Time | Notes |
| | 4 | Udeme Okon | South Africa | 45.69 | |
| | 8 | Jayden Davis | United States | 46.08 | |
| | 7 | Sidi Njie | United States | 46.29 | |
| 4 | 9 | Árpád Kovács | Hungary | 46.60 | |
| 5 | 6 | Kentaro Shirahata | Japan | 46.83 | |
| 6 | 3 | Jay Kumar | India | 46.99 | |
| 7 | 5 | Terrell Thorne | Australia | 47.11 | |
| – | 2 | Walid El Boussiri | Morocco | DQ | TR17.2.3 |