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 Silver Yoshihiko Saito Bronze Aleksandr Belikov
Results Final 10 August Rank Name Nationality Time Notes Rohan Robinson 49.73 Yoshihiko Saito 49.99 Aleksandr Belikov 50.22 4 Pedro Rodrigues 50.43 5 Pedro Piñera 50.81 6 Miro Kocuvan 50.82 7 Rick Jordan 51.16 8 Kazuhiko Yamazaki 51.42
Semifinals 9 August
Semifinal 1 Rank Name Nationality Time Notes 1 Rohan Robinson 50.59 Q 2 Yoshihiko Saito 50.86 Q 3 Pedro Piñera 51.19 Q 4 Rick Jordan 51.23 Q 5 Sammy Biwott 51.94 6 Plamen Nyagin 52.76 7 Matteo Raimondi 53.12 Andrey Semakin DNS
Semifinal 2 Rank Name Nationality Time Notes 1 Aleksandr Belikov 50.47 Q 2 Pedro Rodrigues 50.70 Q 3 Kazuhiko Yamazaki 50.79 Q 4 Miro Kocuvan 50.82 Q 5 Hendrik Willems 51.89 6 Massimo Redaelli 52.27 7 Winston Sinclair 52.68 8 Rubén Menéndez 53.20
Heats 8 August
Heat 1 Rank Name Nationality Time Notes 1 Kazuhiko Yamazaki 51.30 Q 2 Rohan Robinson 51.56 Q 3 Winston Sinclair 51.88 Q 4 Plamen Nyagin 52.13 q 5 Hendrik Willems 52.28 q 6 Massimo Redaelli 52.45 q 7 Abdelhaq Lahlali 53.28
Heat 2 Rank Name Nationality Time Notes 1 Aleksandr Belikov 51.57 Q 2 Rick Jordan 51.95 Q 3 Pedro Rodrigues 52.01 Q 4 Matteo Raimondi 52.42 q 5 Daniel Blochwitz 52.77 6 Óscar Pitillas 52.90 7 Chiu Wensheng 53.21
Heat 3 Rank Name Nationality Time Notes 1 Sammy Biwott 51.64 Q 2 Pedro Piñera 52.53 Q 3 Rubén Menéndez 52.88 Q 4 Simon Hollingsworth 52.90 5 Kostas Pochanis 53.93 6 Jean Philip Brunel 54.16 7 Jürgen Neubarth 54.48
Heat 4 Rank Name Nationality Time Notes 1 Yoshihiko Saito 51.28 Q 2 Miro Kocuvan 52.43 Q 3 Andrey Semakin 52.46 Q 4 Jean-Paul Bruwier 52.64 5 Norge Bell 52.70 6 Thomas Zverina 53.18 7 Jaco van Wyk 53.85 8 Vasilis Flouris 54.66
Participation According to an unofficial count, 29 athletes from 23 countries participated in the event.
References