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Summary
Semi-final 1
| Rank | Name | Nation | Time |
| 1 | Arthur Wint | JAM | 46.3 |
| 2 | Karl-Friedrich Haas | GER | 46.4 |
| 3 | Malvin Whitfield | USA | 46.4 |
| 4 | Gerrard Cole | USA | 46.8 |
| 5 | Ardalion Ignatyev | URS | 47.4 |
| 6 | James Lavery | CAN | 47.7 |
| Rank | Name | Nation | Time |
| 1 | Herb McKenley | JAM | 46.4 |
| 2 | George Rhoden | JAM | 46.5 |
| 3 | Ollie Matson | USA | 46.7 |
| 4 | Hans Geister | GER | 46.7 |
| 5 | John Carroll | CAN | 47.4 |