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Date: 19 July 1924
Summary
Semi-final 1
| Rank | Name | Nation | Time |
| 1 | Duke Kahanamoku | USA | 1:01.6 |
| 2 | Samuel Kahanamoku | USA | 1:02.2 |
| 3 | Katsuo Takaishi | JPN | 1:02.4 |
| 4 | Orvar Trolle | SWE | 1:02.6 |
| 5 | Clayton Bourne | CAN | 1:06.0 |
| 6 | Istvan Barany | HUN | 1:08.0 |
| Did not start | |||
| Torahiko Miyahata | JPN | ||
| Rank | Name | Nation | Time |
| 1 | Johnny Weissmuller | USA | 1:00.8 |
| 2 | Arne Borg | SWE | 1:02.6 |
| 3 | Ernest Henry | AUS | 1:03.0 |
| 4 | Alfred Pycock | GBR | 1:05.0 |
| 5 | Ivan Stedman | AUS | 1:06.0 |
| 6 | Alberto Zorrilla | ARG | 1:07.6 |