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Summary
Semi-final 1
| Rank | Name | Nation | Time |
| 1 | Otis Davis | USA | 45.5 |
| 2 | Milkha Singh | IND | 45.9 |
| 3 | Manfred Kinder | GER | 46.0 |
| 4 | Robbie Brightwell | GBR | 46.1 |
| 5 | Gordon Day | RSA | 46.7 |
| 6 | Kevan Gosper | AUS | 47.1 |
| Rank | Name | Nation | Time |
| 1 | Carl Kaufmann | GER | 45.7 |
| 2 | Malcolm Spence | RSA | 45.8 |
| 3 | Earl Young | USA | 46.1 |
| 4 | Abdul Karim Amu | NGR | 46.6 |
| 5 | Malcolm Spence | WIF | 46.8 |
| 6 | Jack Yerman | USA | 48.9 |