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Summary
Semi-final 1
| Rank | Name | Nation | Time |
| 1 | Harrison Dillard | USA | 10.5 |
| 2 | Barney Ewell | USA | 10.5 |
| 3 | Alastair McCorquodale | GBR | 10.7 |
| 4 | John Bartram | AUS | |
| 5 | Juan Lopez | URU | |
| 6 | Morris Curotta | AUS |
| Rank | Name | Nation | Time |
| 1 | Mel Patton | USA | 10.4 |
| 2 | Lloyd LaBeach | PAN | 10.5 |
| 3 | Emmanuel McDonald Bailey | GBR | 10.6 |
| 4 | John Treloar | AUS | |
| 5 | Rafael Fortun | CUB | |
| 6 | Kenneth Jones | GBR |