The men's 400 metres event at the 1951 Pan American Games was held at the Estadio Monumental in Buenos Aires on 3 and 4 March.Full results
Medalists GoldSilverBronzeMal WhitfieldHugo MaioccoHerb McKenley
Results Heats Held on 3 March Rank Heat Name Nationality Time Notes 1 1 John Voight 50.6 Q 2 1 Angel García 50.6 Q 3 1 Ramón Sandoval 50.7 Q 4 1 Carlos Camargo 51.2 5 1 Anastasio Zelaya 51.5 6 1 Luis Modeste 1 2 Guillermo Evans 57.3 Q 2 2 Gustavo Ehlers 57.4 Q 3 2 Carlos Monges Q 2 Argemiro Roque 2 Evelio Planas 1 3 Herb McKenley 49.0 Q 2 3 Hugo Maiocco 50.0 Q 3 3 Guido Veronese 50.2 Q 4 3 José Zelaya 50.5 5 3 Javier Souza 50.6 1 4 Mal Whitfield 49.2 Q 2 4 Jaime Hitelman 50.6 Q 3 4 Máximo Guerra 50.6 Q 4 4 Guillermo Gutiérrez 51.2 4 Jacinto González
Semifinals Held on 3 March Rank Heat Name Nationality Time Notes 1 1 Angel García 48.5 Q 2 1 John Voight 48.9 Q 3 1 Gustavo Ehlers 48.9 Q 4 1 Carlos Monges 49.8 5 1 Guillermo Evans 50.8 6 1 Ramón Sandoval 1 2 Mal Whitfield 48.1 Q 2 2 Herb McKenley 48.9 Q 3 2 Hugo Maiocco 49.0 Q 4 2 Jaime Hitelman 49.5 5 2 Guido Veronese 49.7 6 2 Máximo Guerra
Final Held on 4 March Rank Name Nationality Time Notes Mal Whitfield 47.8 Hugo Maiocco 48.0 Herb McKenley 48.2 4 John Voight 48.3 5 Angel García 48.4 6 Gustavo Ehlers 49.4
References