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Summary
Semi-final 1
| Rank | Name | Nation | Time |
| 1 | William Carr | USA | 47.2 |
| 2 | Alexander Wilson | CAN | 47.8 |
| 3 | George Golding | AUS | 48.0 |
| 4 | Godfrey Rampling | GBR | 48.0 |
| 5 | Felix Rinner | AUT | 48.8 |
| 6 | Joachim Buchner | GER | 49.2 |
| Rank | Name | Nation | Time |
| 1 | Benjamin Eastman | USA | 47.6 |
| 2 | William Walters | RSA | 48.2 |
| 3 | James Gordon | USA | 48.2 |
| 4 | Borje Strandvall | FIN | 48.6 |
| 5 | Crew Stoneley | GBR | |
| 6 | James Ball | CAN |