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Summary
Quarter-final 1
| Rank | Name | Nation | Time |
| 1 | Carl Kaufmann | GER | 46.5 |
| 2 | Milkha Singh | IND | 46.5 |
| 3 | Malcolm Spence | WIF | 46.9 |
| 4 | Terry Tobacco | CAN | 47.5 |
| 5 | Edgar Davis | RSA | 48.0 |
| 6 | Malcolm Yardley | GBR | 48.8 |
| Did not start | |||
| Alf Pettersson | SWE | ||
| Rank | Name | Nation | Time |
| 1 | Jack Yerman | USA | 46.4 |
| 2 | Kevan Gosper | AUS | 46.5 |
| 3 | Manfred Kinder | GER | 46.7 |
| 4 | James Wedderburn | WIF | 47.0 |
| 5 | German Guenard | PUR | 47.2 |
| 6 | John Wrighton | GBR | 48.0 |
| Rank | Name | Nation | Time |
| 1 | Earl Young | USA | 46.1 |
| 2 | Robbie Brightwell | GBR | 46.2 |
| 3 | Gordon Day | RSA | 46.3 |
| 4 | Jochen Reske | GER | 47.3 |
| 5 | Stanislaw Swatowski | POL | 47.4 |
| 6 | Konstantin Grachev | URS | 47.6 |
| 7 | Bartonjo Rotich | KEN | 47.8 |
| Rank | Name | Nation | Time |
| 1 | Otis Davis | USA | 45.9 |
| 2 | Malcolm Spence | RSA | 46.1 |
| 3 | Abdul Karim Amu | NGR | 46.6 |
| 4 | Jerzy Kowalski | POL | 46.7 |
| 5 | Giuseppe Bommarito | ITA | 47.5 |
| 6 | Barry Robinson | NZL | 48.3 |
| 7 | Louis DeClerck | BEL | 48.4 |