Heat S1 | | time | gap | L | Y | Rk | 1. Dawn Fraser | Australia | 1:03.0 | | 4 | 19 | 1. | 2. Faith Leech | Australia | 1:05.2 | +2.2s | 5 | 15 | 3. | 3. Joan Rosazza | United States | 1:05.9 | +2.9s | 6 | 19 | 7. | 4. Natalie Ann Myburgh | South Africa | 1:06.0 | +3.0s | 3 | 16 | 8. | 5. Valeria Gyenge | Hungary | 1:06.4 | +3.4s | 7 | 23 | 11. | 6. Zsuzsa Ordogh | Hungary | 1:06.9 | +3.9s | 2 | 16 | 14. | 7. Helen Stewart | Canada | 1:06.9 | +3.9s | 1 | _ | 14. | 8. Birgit Klomp | UT Germany | 1:07.9 | +4.9s | 8 | 16 | 16. |
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Heat S2 | | time | gap | L | Y | Rk | 1. Lorraine Crapp | Australia | 1:03.1 | +0.1s | 4 | 18 | 2. | 2. Marion Roe | New Zealand | 1:05.3 | +2.3s | 6 | 21 | 4. | 3. Virginia Grant | Canada | 1:05.5 | +2.5s | 5 | _ | 5. | 4. Shelley Mann | United States | 1:05.5 | +2.5s | 3 | 19 | 6. | 5. Kate Jobson | Sweden | 1:06.1 | +3.1s | 1 | 19 | 9. | 6. Nancy Simons | United States | 1:06.1 | +3.1s | 2 | 18 | 9. | 7. Susan Roberts | South Africa | 1:06.6 | +3.6s | 8 | 17 | 12. | 8. Jeanette Myburgh | South Africa | 1:06.7 | +3.7s | 7 | 16 | 13. |
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