2021 World Athletics U20 Championships – Men's 400 metres
# 2021 World Athletics U20 Championships – Men's 400 metres

The men's 400 metres at the 2021 World Athletics U20 Championships was held at the Kasarani Stadium 18 and 21 August.

## Records

Standing records prior to the 2021 World Athletics U20 Championships :

| World U20 Record | Steve Lewis (USA) | 43.87 | Seoul, South Korea | 28 September 1988 |
| - | - | - | - | - |
| Championship Record | Hamdan Odha Al-Bishi (KSA) | 44.66 | Santiago, Chile | 20 October 2000 |
| World U20 Leading | Johnnie Blockburger (USA) | 44.71 | Tucson, United States | 10 April 2021 |

## Results

### Heats

Qualification: First 2 of each heat (Q) and the 2 fastest times (q) qualified for the final.

| Rank | Heat | Name | Nationality | Time | Note |
| - | - | - | - | - | - |
| 1 | 1 | Luis Avilés Ferreiro | Mexico | 45.63 | Q, NU20R |
| 2 | 2 | Anthony Pesela | Botswana | 45.88 | Q, PB |
| 3 | 2 | Antonie Matthys Nortje | South Africa | 46.27 | Q, PB |
| 4 | 1 | Lorenzo Benati | Italy | 46.28 | Q |
| 5 | 1 | Muzala Samukonga | Zambia | 46.45 | q |
| 6 | 1 | Michael Roth | Canada | 46.51 | q, PB |
| 7 | 3 | Lythe Pillay | South Africa | 46.55 | Q |
| 8 | 2 | Elkanah Kiprotich Chemelil | Kenya | 46.79 | PB |
| 9 | 3 | Kennedy Kimeu | Kenya | 47.05 | Q, SB |
| 10 | 2 | David Mulenga | Zambia | 47.16 | |
| 11 | 3 | Raman Valodzkin | Belarus | 47.17 | |
| 12 | 3 | Bamidele Ajayi | Nigeria | 47.44 | |
| 13 | 2 | Dubem Amene | Nigeria | 47.50 | |
| 13 | 3 | Revon Williams | Guyana | 47.50 | |
| 15 | 3 | Anbar Jamaan Al-Zahrani | Saudi Arabia | 47.51 | |
| 16 | 1 | Remus Andrei Niculiță | Romania | 47.73 | |
| 16 | 3 | Tahj Hamm | Jamaica | 47.73 | |
| 18 | 2 | Patryk Grzegorzewicz | Poland | 47.80 | |
| 19 | 1 | Tadeáš Plaček | Czech Republic | 47.87 | |
| 20 | 2 | Isuru Bans | Sri Lanka | 48.02 | |
| 21 | 2 | Adrian Bondoc | Romania | 48.29 | |
| 22 | 1 | Vinicius Moura | Brazil | 49.59 | |
| 23 | 3 | Mohamed Basiru Bah | Sierra Leone | 49.82 | PB |
| | 1 | Jeremy Bembridge | Jamaica | DNF | |

### Final

The final was held on 21 August at 17:19.

| Rank | Lane | Name | Nationality | Time | Note |
| - | - | - | - | - | - |
| | 5 | Anthony Pesela | Botswana | 44.58 | CR |
| | 6 | Luis Avilés | Mexico | 44.95 | NU20R |
| | 3 | Antonie Nortje | South Africa | 45.32 | PB |
| 4 | 4 | Lythe Pillay | South Africa | 45.53 | PB |
| 5 | 1 | Muzala Samukonga | Zambia | 45.89 | PB |
| 6 | 7 | Lorenzo Benati | Italy | 46.06 | PB |
| 7 | 2 | Michael Roth | Canada | 46.10 | PB |
| 8 | 8 | Kennedy Kimeu | Kenya | 46.51 | SB |
