# 1990 World Junior Championships in Athletics – Men's 400 metres hurdles

The men's 400 metres hurdles event at the 1990 World Junior Championships in Athletics was held in Plovdiv, Bulgaria, at Deveti Septemvri Stadium on 8, 9 and 10 August.

## Medalists

| Gold | Rohan Robinson Australia |
| Silver | Yoshihiko Saito Japan |
| Bronze | Aleksandr Belikov Soviet Union |

## Results
### Final

10 August
| Rank | Name | Nationality | Time |
| | Rohan Robinson | Australia | 49.73 |
| | Yoshihiko Saito | Japan | 49.99 |
| | Aleksandr Belikov | Soviet Union | 50.22 |
| 4 | Pedro Rodrigues | Portugal | 50.43 |
| 5 | Pedro Piñera | Cuba | 50.81 |
| 6 | Miro Kocuvan | Yugoslavia | 50.82 |
| 7 | Rick Jordan | United States | 51.16 |
| 8 | Kazuhiko Yamazaki | Japan | 51.42 |

### Semifinals

9 August

#### Semifinal 1

| Rank | Name | Nationality | Time | Notes |
| 1 | Rohan Robinson | Australia | 50.59 | Q |
| 2 | Yoshihiko Saito | Japan | 50.86 | Q |
| 3 | Pedro Piñera | Cuba | 51.19 | Q |
| 4 | Rick Jordan | United States | 51.23 | Q |
| 5 | Sammy Biwott | Kenya | 51.94 | |
| 6 | Plamen Nyagin | Bulgaria | 52.76 | |
| 7 | Matteo Raimondi | Italy | 53.12 | |
| | Andrey Semakin | Soviet Union | DNS | |

#### Semifinal 2

| Rank | Name | Nationality | Time | Notes |
| 1 | Aleksandr Belikov | Soviet Union | 50.47 | Q |
| 2 | Pedro Rodrigues | Portugal | 50.70 | Q |
| 3 | Kazuhiko Yamazaki | Japan | 50.79 | Q |
| 4 | Miro Kocuvan | Yugoslavia | 50.82 | Q |
| 5 | Hendrik Willems | West Germany | 51.89 | |
| 6 | Massimo Redaelli | Italy | 52.27 | |
| 7 | Winston Sinclair | Jamaica | 52.68 | |
| 8 | Rubén Menéndez | Spain | 53.20 | |

### Heats

8 August

#### Heat 1

| Rank | Name | Nationality | Time | Notes |
| 1 | Kazuhiko Yamazaki | Japan | 51.30 | Q |
| 2 | Rohan Robinson | Australia | 51.56 | Q |
| 3 | Winston Sinclair | Jamaica | 51.88 | Q |
| 4 | Plamen Nyagin | Bulgaria | 52.13 | q |
| 5 | Hendrik Willems | West Germany | 52.28 | q |
| 6 | Massimo Redaelli | Italy | 52.45 | q |
| 7 | Abdelhaq Lahlali | Morocco | 53.28 | |

#### Heat 2

| Rank | Name | Nationality | Time | Notes |
| 1 | Aleksandr Belikov | Soviet Union | 51.57 | Q |
| 2 | Rick Jordan | United States | 51.95 | Q |
| 3 | Pedro Rodrigues | Portugal | 52.01 | Q |
| 4 | Matteo Raimondi | Italy | 52.42 | q |
| 5 | Daniel Blochwitz | East Germany | 52.77 | |
| 6 | Óscar Pitillas | Spain | 52.90 | |
| 7 | Chiu Wensheng | Chinese Taipei | 53.21 | |

#### Heat 3

| Rank | Name | Nationality | Time | Notes |
| 1 | Sammy Biwott | Kenya | 51.64 | Q |
| 2 | Pedro Piñera | Cuba | 52.53 | Q |
| 3 | Rubén Menéndez | Spain | 52.88 | Q |
| 4 | Simon Hollingsworth | Australia | 52.90 | |
| 5 | Kostas Pochanis | Cyprus | 53.93 | |
| 6 | Jean Philip Brunel | France | 54.16 | |
| 7 | Jürgen Neubarth | Austria | 54.48 | |

#### Heat 4

| Rank | Name | Nationality | Time | Notes |
| 1 | Yoshihiko Saito | Japan | 51.28 | Q |
| 2 | Miro Kocuvan | Yugoslavia | 52.43 | Q |
| 3 | Andrey Semakin | Soviet Union | 52.46 | Q |
| 4 | Jean-Paul Bruwier | Belgium | 52.64 | |
| 5 | Norge Bell | Cuba | 52.70 | |
| 6 | Thomas Zverina | Canada | 53.18 | |
| 7 | Jaco van Wyk | Namibia | 53.85 | |
| 8 | Vasilis Flouris | Greece | 54.66 | |

## Participation

According to an unofficial count, 29 athletes from 23 countries participated in the event.
* Australia (2)
* Austria (1)
* Belgium (1)
* Bulgaria (1)
* Canada (1)
* Chinese Taipei (1)
* Cuba (2)
* Cyprus (1)
* East Germany (1)
* France (1)
* Greece (1)
* Italy (2)
* Jamaica (1)
* Japan (2)
* Kenya (1)
* Morocco (1)
* Namibia (1)
* Portugal (1)
* Soviet Union (2)
* Spain (2)
* United States (1)
* West Germany (1)
* Yugoslavia (1)